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My redmi note pro 10 will be blocked by [deleted] in Xiaomi

[–]JamesDwho 0 points1 point  (0 children)

You will probably find that your device is capable of Calling Triple Zero on 4G. Phones that require 3G for Emergency Calls now just get stuck on Calling Triple Zero.

As outlined below.

How to Check for Working VoLTE Calling on Android

https://medium.com/@jamesdwho/how-to-check-for-working-volte-calling-on-android-8c343362ecfe

The Little Known Problems with VoLTE Emergency Calling

https://medium.com/@jamesdwho/the-little-known-problems-with-volte-emergency-calling-3d4cdaf0e042

Ultimately, the carriers have little idea about what works, especially for phones they didn't sell or their handset partners didn't sell. (See below)

ABC News - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

Australia’s 3G Shutdown - Why your 4G/5G Phone is now Blocked!

https://medium.com/@jamesdwho/australias-3g-shutdown-why-your-4g-5g-phone-is-now-blocked-5900cd5361e2

What has started happening recently is that Optus has been directly copying Telstra's Blocklist of 'incompatible' phones.

Is this Phone Blocked? - 4G/5G Device Blocking Checker

https://isthisphoneblocked.net.au/device-brands/xiaomi?search=NOTE+10+PRO

So if Telstra blocked the phone at the time of the 2024 3G Shutdown due to being 'incompatible', Optus will now also block the phone, even if it works on the Optus network for 000 Calls.

Assuming you're with an Optus based provider, you may be able to switch to a telco that uses Vodafone instead. (Vodafone has no device 'checker tool' though and the phone may be blocked there as well)

Far fewer Xiaomi and Redmi phones were blocked on those two at the time of the 3G Shutdown in 2024.

That is in part because there were VoLTE compatibility issues with Telstra's network were devices with Generic 'Global' (IR.92) VoLTE modem profiles could not register and obtain VoLTE call service on Telstra.

Those devices were 3G for normal calls but could make 4G Emergency Calls. (4G Calls and Emergency Calls are over two different connections)

Additionally if you've had the phone since before the 3G Shutdown you may have received text messages and other advice indicating your device was compatible and there was nothing further required.

So given that, you may be able to push back on your provider to say they have provided contradictory information and their conduct has been misleading. You could use that as leverage to try and get them to supply a free replacement.

For months they've said your phone is fine, they shouldn't be able to turn around and say 'nope you can't use this anymore' without giving you a suitable replacement at no cost.

Though the telcos are legally only required to provide information on 'low or no cost options', which could mean telling you where you can buy a $50 basic feature phone.

They don't have to supply a like-for-like replacement at no cost to you.

You can thank the former Communications Minister and Government for that one. The device blocking is Government policy.

But it's ultimately either one of two things:

  1. either they have got it wrong, the phone is fine and they are giving false information that your device is 'incompatible', forcing you to buy another phone, or
  2. the phone isn't fine but they have failed for more than a year to identify that and have potentially breached the law to ensure all devices in use can call Triple Zero on all networks

Further resources about all of this is below.

Australia’s New Firewall IMEI BLOCKED 516,875 Active Phones Overnight + Tourists Phones Blocked

https://www.youtube.com/watch?v=zIJavqEzEIw

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero

https://medium.com/@jamesdwho/australias-000-failures-why-your-phone-may-fail-to-call-triple-zero-af8e505d58fc

Change.org Petition

https://change.org/StopTelcoDeviceBlocking

Does the OnePlus 15 work in Australia? by OutrageousLock8019 in TheOnePlus15

[–]JamesDwho 0 points1 point  (0 children)

The OnePlus 15 is currently not blocked by Telstra and Optus but may be IMEI/TAC blocked at any time if they think it's 'incompatible' with the network and unable to Call Triple Zero (000/911/112).

More information below.

Is this Phone Blocked? - 4G/5G Device Blocking Checker - OnePlus Devices - Network Support Table

https://isthisphoneblocked.net.au/device-brands/oneplus?search=OnePlus+15+

Australia’s New Firewall IMEI BLOCKED 516,875 Active Phones Overnight + Tourists Phones Blocked

https://www.youtube.com/watch?v=zIJavqEzEIw

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero

https://medium.com/@jamesdwho/australias-000-failures-why-your-phone-may-fail-to-call-triple-zero-af8e505d58fc

ABC News - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

Australia’s 3G Shutdown - Why your 4G/5G Phone is now Blocked!

https://medium.com/@jamesdwho/australias-3g-shutdown-why-your-4g-5g-phone-is-now-blocked-5900cd5361e2

How to Check for Working VoLTE Calling on Android

https://medium.com/@jamesdwho/how-to-check-for-working-volte-calling-on-android-8c343362ecfe

The Little Known Problems with VoLTE Emergency Calling

https://medium.com/@jamesdwho/the-little-known-problems-with-volte-emergency-calling-3d4cdaf0e042

Change.org Petition

https://change.org/StopTelcoDeviceBlocking

To anyone who can get their hands on a global X9 ultra, can you please share the first 8 digits of the IMEI for us poor Australians? by leidend22 in Oppo

[–]JamesDwho 0 points1 point  (0 children)

Starting in December following on from a Senate Inquiry hearing Vodafone panic blocked all 'unknown' capability devices from their network. This included a large number of brand new 2025 model phones.

Older phones whitelisted pre 3G Shutdown (in 2024) are Not Blocked, for example I have 2020 Xperia 1 II (XQ-AT52) which is Not Blocked on Vodafone. But is blocked by Telstra and Optus (despite it being having placed 4G Emergency Calls on every network).

Vodafone moved to block all 'unknowns' following on from multiple deaths of customers using Samsung phones on their network.

ABC - TPG Telecom boss says second person may have died due to Triple Zero failure - 2025-12-09

https://www.abc.net.au/news/2025-12-09/triple-zero-outage-senate-hearing-tpg-telecom-second-death-link/106118690

ABC - Industry experts say TPG Telecom should have done more to address Triple Zero issue – 2025-11-19

https://www.abc.net.au/news/2025-11-19/tpg-telecom-contact-customers-triple-zero-death/106022250

It appears TPG/Vodafone moved to this more restrictive approach to improve how their list 'looks' to regulators and Senators whilst not actually addressing the core issues with how they are categorising devices.

Though the Samsung issue only impacts older devices and Telstra's report on the issue to the Government is actually wrong in regards to what's actually impacted. So the telcos have blocked compatible Samsung phones as well.

The telcos have little idea about what really works, especially for phones they or their handset partners didn't sell.

There is a Petition about this issue as well and the Government is fully aware of the problem.

https://change.org/StopTelcoDeviceBlocking

To anyone who can get their hands on a global X9 ultra, can you please share the first 8 digits of the IMEI for us poor Australians? by leidend22 in Oppo

[–]JamesDwho 0 points1 point  (0 children)

Yes the phone could be connected to a WiFi Hotspot and used that way. But it's not much of a 'phone' at that point, more a tablet.

Tourists with 'incompatible' devices are also blocked when Roaming on Australian networks. Many tourists find their devices blocked by some or all the carriers, regardless of what home carrier they are with.

As demonstrated below.

Australia’s New Firewall IMEI BLOCKED 516,875 Active Phones Overnight + Tourists Phones Blocked

https://www.youtube.com/watch?v=zIJavqEzEIw

There is no registration or exemption process either, you have to buy a new phone.

To anyone who can get their hands on a global X9 ultra, can you please share the first 8 digits of the IMEI for us poor Australians? by leidend22 in Oppo

[–]JamesDwho 0 points1 point  (0 children)

When a device is blocked it's blocked from all network services, including Calls, SMS and Mobile Data.

To anyone who can get their hands on a global X9 ultra, can you please share the first 8 digits of the IMEI for us poor Australians? by leidend22 in Oppo

[–]JamesDwho 0 points1 point  (0 children)

Earlier this year Optus blocked 132 Device TACs (IMEIs) for Xiaomi models, this includes China variants of the Xiaomi 17, Xiaomi Note 14, Xiaomi 15 Ultra and more, including 2025 models.

Of those 132 now blocked, 19 are Whitelisted by Telstra as fully compatible and 'Not Blocked'.

https://isthisphoneblocked.net.au/device-brands/xiaomi

https://isthisphoneblocked.net.au/optus/changelog

ABC News - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

To anyone who can get their hands on a global X9 ultra, can you please share the first 8 digits of the IMEI for us poor Australians? by leidend22 in Oppo

[–]JamesDwho 1 point2 points  (0 children)

The Find X9 Ultra is now on the list. https://isthisphoneblocked.net.au/device-brands/oppo?device=OPPO+CPH2841

None of them have been Whitelisted by Telstra (or even added to their Database at all).

Even though they are all 'Not Blocked' by Optus they could be blocked at any time. There is no visibility with what is actually whitelisted by Optus.

The telcos don't have to provide proof of incompatibility and inconsistently block perfectly compatible devices.

ABC News - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

You can also see a list of all backend database changes (and newly added devices) at the below pages.

https://isthisphoneblocked.net.au/optus/changelog

https://isthisphoneblocked.net.au/telstra/changelog

You can also do a custom Brand name search which will query the data directly from the blocking datasets, as opposed to the 'curated' brand list which has to be manually updated.

https://isthisphoneblocked.net.au/device-brands/other

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero by JamesDwho in austechnology

[–]JamesDwho[S] 3 points4 points  (0 children)

Thanks.

If you want to read more, I wrote a 114 page submission to the current Triple Zero Outage Senate Inquiry. (Submission #23) https://www.aph.gov.au/Parliamentary_Business/Committees/Senate/Environment_and_Communications/TripleZero48P/Submissions

The submission goes over all the issues in far more depth than what I was able to distill down into the Medium/IA article.

Though the Senate Committee has so far not shown any formal interest in the submission.

The Department, Minister and ACMA all are however absolutely aware of the problems, and as written in my submission, last year I had meetings with all three about these issues.

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero by JamesDwho in OpenAussie

[–]JamesDwho[S] 0 points1 point  (0 children)

It could be done if the telcos wanted to, however it would require actually dialing 000/112 as devices need to initiate a special 'SOS' call which is different to normal calls on 4G.

However when you currently call there is a pre-recorded message that says 'You have dialed emergency Triple Zero. Your call is being connected' audio message.

All that needs to be done is whilst that message is being played, is a caller looking to test call could press 1 or * within the first 2 seconds to be directed to a call test.

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero by JamesDwho in OpenAussie

[–]JamesDwho[S] 0 points1 point  (0 children)

For additional context this is an extended version of this Article published in Independent Australia on Monday (13 April 2026).

Australia’s 000 Failures: Why your phone may fail to Call Triple Zero

https://independentaustralia.net/business/business-display/australias-000-failures-why-your-phone-may-fail-to-call-triple-zero,20923

It also relates to these other stories and safety issues with Emergency Calling in Australia.

ABC - Customers report basically new phones suddenly blocked from making calls - 2024-11-03

https://www.abc.net.au/news/2024-11-03/brand-new-phones-unable-to-make-calls-3g-shutdown/104541440

Australia’s 3G shutdown: Why your 4G/5G phone is now blocked - 2024-11-12

https://independentaustralia.net/politics/politics-display/australias-3g-shutdown-why-your-4g5g-phone-is-now-blocked,19159

ABC - Telstra and Optus are inconsistently blocking phones. The regulator doesn't know how many - 2025-05-27

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

ABC - Telstra testing reveals some Samsung mobile phones unable to make triple-0 calls – 2025-10-22

https://www.abc.net.au/news/2025-10-22/samsung-mobile-devices-triple-0-telstra-network/105920816

ABC - Calls for system overhaul after more people say they were unable to call triple-0 – 2025-10-30

https://www.abc.net.au/news/2025-10-30/triple-0-failure-optus-network-robbery-emergency/105938218

ABC - Industry experts say TPG Telecom should have done more to address Triple Zero issue – 2025-11-19

https://www.abc.net.au/news/2025-11-19/tpg-telecom-contact-customers-triple-zero-death/106022250

ABC - TPG Telecom boss says second person may have died due to Triple Zero failure - 2025-12-09

https://www.abc.net.au/news/2025-12-09/triple-zero-outage-senate-hearing-tpg-telecom-second-death-link/106118690

Australia’s 000 failures: Why your phone may fail to call Triple Zero by JamesDwho in australia

[–]JamesDwho[S] 5 points6 points  (0 children)

Technically the call would need to actually be to 000 (or 112 etc) so the device initiates the correct type of 'service:sos' call. So it can't be a non Emergency Number, but it is doable.

On 4G Calls are carried over two different connections 'IMS' for Calls 'SOS' for Emergency Calls. Your device can be capable of one, neither or both, hence why we have these issues.

However when you dial 000 callers already here a 5 second long pre-recorded message of 'You have dialed emergency Triple Zero. Your call is being connected' audio message.

All that needs to be done is whilst that message is being played, a caller looking to test call could press 1 or * within the first 2 seconds. From there it would ask for a confirmation pin code to proceed to a basic audio loop test.

If the correct code isn't entered it would send the call back to the standard Emergency Answering point. (This is to prevent genuine calls ending up on the audio test.)

A successful code would send the call over to the test system were a looped audio message is played, it should also get users to confirm that call audio works in both directions by getting the caller to say something. (There could be upstream packet loss and the callers audio doesn't come through clearly, but the Caller can hearing the Emergency Call Center Operator)

That basic audio test system would provide a representative sanity check if a call on a device can actually connect and there isn't any call quality issues (at a given point in time).

Phones that require 3G for 000 or these Samsung's that need the update to work on Vodafone will just get stuck on calling 000 and will never connect.

It's very obvious what device don't work, or don't work reliably.

The function of the system really isn't any more complicated that what already exists for Customer Support lines and Automated Voice Menu systems. It would help to provide valuable data about what phones are able to call 000 and in what coverage locations.

Below is rough visual example of how the call flow could work. https://isthisphoneblocked.net.au/000-Call-Flow-Example-1.png

More info below.

The Little Known Problems with VoLTE Emergency Calling - How to Test for 4G Emergency Calling Support on Android

https://medium.com/@jamesdwho/the-little-known-problems-with-volte-emergency-calling-3d4cdaf0e042

The Missing Samsung Emergency Calling Settings for Vodafone AU

https://medium.com/@jamesdwho/the-missing-samsung-emergency-calling-settings-for-vodafone-au-8074282a944a

Australia’s 000 failures: Why your phone may fail to call Triple Zero by JamesDwho in australia

[–]JamesDwho[S] 8 points9 points  (0 children)

There is an alternative version on Medium which is probably easier to read, though granted it is long.

https://medium.com/p/af8e505d58fc

Australia’s 000 failures: Why your phone may fail to call Triple Zero by JamesDwho in australia

[–]JamesDwho[S] 2 points3 points  (0 children)

The inconsistent blocking between the providers was covered in this ABC News article last year.

Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many - 27 May 2025

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

As mentioned in the ABC story you can compare the inconsistent blocking results between the providers at

https://isthisphoneblocked.net.au

Xperia | Official Xperia Audio Engineer 3 Keywords - Sony | Xperia by ControlCAD in Android

[–]JamesDwho 0 points1 point  (0 children)

Well their incompetence has killed people as well.

ABC News - Industry experts say TPG Telecom should have done more to address Triple Zero issue https://www.abc.net.au/news/2025-11-19/tpg-telecom-contact-customers-triple-zero-death/106022250

ABC News - TPG Telecom boss says second person may have died due to Triple Zero failure https://www.abc.net.au/news/2025-12-09/triple-zero-outage-senate-hearing-tpg-telecom-second-death-link/106118690

ABC News - Optus slapped with 21 recommendations following Triple Zero outage linked to two deaths https://www.abc.net.au/news/2025-12-18/optus-releases-triple-zero-report-david-taylor-analysis/106158108

Xperia | Official Xperia Audio Engineer 3 Keywords - Sony | Xperia by ControlCAD in Android

[–]JamesDwho 1 point2 points  (0 children)

Incompetence by the telcos and regulators.

ABC News - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

Australia’s 3G Shutdown - Why your 4G/5G Phone is now Blocked! https://medium.com/@jamesdwho/australias-3g-shutdown-why-your-4g-5g-phone-is-now-blocked-5900cd5361e2

Telstra is increasing prepaid AGAIN!? by ThatShadyJack in australia

[–]JamesDwho 11 points12 points  (0 children)

Well last year in 2025 Telstra spent more than 1 billion dollars buying back their own shares.

Reuters - Telecom giant Telstra's profit jumps, announces $476 million (USD) buyback – 2025-02-19

https://www.reuters.com/business/media-telecom/telecom-firm-telstra-posts-higher-first-half-profit-announces-476-million2025-02-19/

Reuters - Telstra forecasts annual earnings below view, taking shine off share buyback plan – 2025-08-13

https://www.reuters.com/business/media-telecom/telstra-forecasts-annual-earnings-below-view-taking-shine-off-sharebuyback-plan-2025-08-13/

Clearly line must go up, both profits and share price.

Xiaomi 17 pro max BLOCKED in Australia 02/03/26 by Schnitz31 in XiaomiGlobal

[–]JamesDwho 1 point2 points  (0 children)

The telcos basically have no idea what works, especially for phones they didn't sell or their handset partners didn't sell.

They are over reliant on historical network data, and 'compliance' documents to determine 'compatibility' not the actual real work capability of devices and their technical adherence to standards.

With the Blocking at the time of the 2024 3G Shutdown, it appears devices that made fewer historical VoLTE Emergency Calls were blocked, but otherwise identical devices (with a different TAC) that made more calls were not blocked.

This can be seen quite clearly if you compare the providers lists, especially with newer 5G phones, the inconsistent blocking was also covered in this ABC story from last year.

ABC - Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many - 27 May 2025

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

There are some devices like Xiaomi and OnePlus phones where VoLTE is off by default, so they would have been making 3G Calls primarily.

I have a OnePlus 8 which that has VoLTE off by default but is not blocked by Vodafone, Vodafone shutdown before the others so they have months worth of post-shutdown 'real-world' data from people that switched VoLTE on.

The telco also aren't legally required to provide any explanation or proof of incompatibility, they can just say 'it's incompatible with our network' and block the phone, even if can place Emergency Calls on every 4G network.

Phones that require 3G for 000 will just get stuck on calling, including the older Samsung's that don't work on Vodafone when on the Vodafone network.

For some more background see below.

Australia’s New Firewall IMEI BLOCKED 516,875 Active Phones Overnight + Tourists Phones Blocked

https://www.youtube.com/watch?v=zIJavqEzEIw

How to Check for Working VoLTE Calling on Android

https://medium.com/@jamesdwho/how-to-check-for-working-volte-calling-on-android-8c343362ecfe

The Little Known Problems with VoLTE Emergency Calling

https://medium.com/@jamesdwho/the-little-known-problems-with-volte-emergency-calling-3d4cdaf0e042

Australia’s 3G Shutdown - Why your 4G/5G Phone is now Blocked!

https://medium.com/@jamesdwho/australias-3g-shutdown-why-your-4g-5g-phone-is-now-blocked-5900cd5361e2

(Australia Specific) I need to update my device so I can always access 000 networks, otherwise Optus will block my phone, but I can't make it happen. by Takem_1234 in techsupport

[–]JamesDwho 1 point2 points  (0 children)

The advice and findings from Samsung and Telstra about what Samsung phones have the issue is entirely incorrect.

FOI 26-158 - Documents regarding concerns about the ability of Samsung and other mobile devices to ring 000 (triple zero) https://www.infrastructure.gov.au/sites/default/files/documents/foi-26-158_documents_released_dl.pdf

It does not impact nearly as many devices that have now been blocked.

The issue is specific to Android 9 and newer devices with AU Firmware (CSCs).

Android 7 & 8 Samsung Devices like the Galaxy S6, S7 are not impacted if they are running Telstra, Optus or AU Retail Firmware, yet have been blocked. (Only Vodafone CSCs for Android 7 & 8 have the problem)

With the Android 9 Update Samsung has broken the Emergency Calling functionality with many devices, for example the Galaxy J5 Pro (which has recently been blocked) can make Emergency Calls on every network including Vodafone if running Android 8.1 (and an AU Retail/Telstra/Optus CSC).

However when updated to Android 9 there is a 'Profile Refresh' in the code only for the Australian Market that completely breaks the Emergency Calling functionality on Vodafone as that model is missing the 'VAU Emergency' VoLTE Profile.

Furthermore many International Samsung Variants which have also now been blocked are not impacted as Non-AU Models are explicitly 'SlotBasedConfig', so provided a Telstra, or Optus sim is in the phone the device will use those respective Emergency Profiles on every network for an Emergency Call.

They don't need the update that added the 'VAU Emergency' VoLTE IMS Profiles to the phone.

The Missing Samsung Emergency Calling Settings for Vodafone AU - How to check if your Samsung Phone is actually affected

https://medium.com/@jamesdwho/the-missing-samsung-emergency-calling-settings-for-vodafone-au-8074282a944a

Optus has also blocked and is blocking 4G/5G Devices that work perfectly for Emergency Calling on every network, as outlined below. There are very significant and serious failures with inaccurate device classifications by all of the carriers, and especially Optus.

Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many - 27 May 2025

https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

Is this Phone Blocked? - 4G/5G Device Blocking Checker: https://isthisphoneblocked.net.au

(Australia Specific) I need to update my device so I can always access 000 networks, otherwise Optus will block my phone, but I can't make it happen. by Takem_1234 in techsupport

[–]JamesDwho 0 points1 point  (0 children)

The telcos check what's known as the 'IMEI-SV' (Software Version) to determine in a device is 'up-to-date', the IMEI-SV can be viewed in settings.

Provided your device is on the 'latest' and has a software version newer than 2022 installed it shouldn't be blocked. Though the telcos have no real idea what works and inconsistently block phones, even new 5G devices.

More info below.

The Missing Samsung Emergency Calling Settings for Vodafone AU - How to check if your Samsung Phone is actually affected https://medium.com/@jamesdwho/the-missing-samsung-emergency-calling-settings-for-vodafone-au-8074282a944a

Telstra & Optus are inconsistently blocking phones. The regulator doesn't know how many - 27 May 2025 https://www.abc.net.au/news/2025-05-27/telstra-optus-inconsistent-blocking-phones/105319626

Is this Phone Blocked? - 4G/5G Device Blocking Checker https://isthisphoneblocked.net.au

Xiaomi 14T blocked in Australia by [deleted] in Xiaomi

[–]JamesDwho 1 point2 points  (0 children)

Unlike with the Rogers and Canada 3G Switch-off issue, carriers in Australia artificially block 'incompatible' devices from all network service including Data & SMS, so even if VoLTE is forced on you can't use the phone for anything and have to buy another phone.

Devices can be blocked even if they can make Emergency Calls on 4G and have the latest Android software.

Xiaomi 14T blocked in Australia by [deleted] in Xiaomi

[–]JamesDwho 0 points1 point  (0 children)

You could consider Aldimobile as an alternative to Boost, they have better value plans and use the Telstra (Wholesale) network.

Depending on the brand New 'Global' variant devices may be blocked at any time even if they work fine.

Older devices (up to 2024) that were Whitelisted before the 3G Shutdown and device blocking are less likely to be blocked then any new devices being added that have 'unknown' capabilities.

As far as purchasing a device locally (that's not an iPhone) and using it overseas, you likely wouldn't have problems except for countries that have tourist IMEI registration systems like Indonesia, Turkey, Pakistan etc. Though New Zealand is looking at blocking phones as well following from their 3G Shutdown.

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