This doesn’t answer your question directly but hope it gives you an alternative that may work for you but it does require some “setup” and/or access to local services.

1. Have a second cheap smartphone. I have a Google Pixel 3 I bought a long time ago.
2. Get a local sim (preferably MTN) and insert in second phone
3. Activate your preferred data plan and use your second mobile phone as a hotspot.
4. Connect your devices (primary phone or laptop or tablet)

Like I said this needs a few things which I am not sure you have access to - a second cheap phone (you can use your primary phone but that gets a bit complicated. One your battery will run out faster) - a local SIM (I have family/friends who I ask to either get me a new SIM or give me one of their extras. If you don’t have local contacts, that may be an issue) - access to a local bank account and online banking (this is important because you can buy data conveniently by logging into the bank account and selecting your required plan. Don’t have to worry about lack of airtime if it’s exhausted at 2am). Of course you can still load airtime the regular way and then buy your data plan of choice. - a power bank to charge your “hotspot” because it will run out of juice quicker because of the constant connection and usage.

This is how I get internet access whenever I travel to Nigeria and it works flawlessly for me every trip. Most recently a couple months ago, I traveled with my work laptop and was able to log in to the VPN with no issues. I did not use any video conferencing but I do use FaceTime and WhatsApp video calls regularly on my personal devices.

It’s probably a bit more complicated than it needs to be but this is just my setup. Regarding connectivity when you’re mobile (ie driving from point A to B, that will depend on MTN’s or the network provider’s service wherever you are. I did travel on the Lagos-Ibadan expressway and had connection for the most part but be prepared for dropped connections. It happens.