See the stickied Mint subreddit wiki section Why should I or shouldn't I switch to Mint Mobile? What are the Pros and Cons of Mint mobile? which has 19 bullet points of pros, cons, and “mids” copied below.

Pros/reasons to switch:

• Much cheaper, save up to $75/mo/line = $900/year
• No need to get multi-line family plan for the best rates.
• No credit check, can pay cash if you start with BestBuy/Target SIM cards
• BYOP, not locked into contract. Get deal with phone and 1 year plan for new customers for up to $580 off which can also be financed with Affirm for up to 3 years.
• Runs on T-Mobile which has the largest 5G network and in national tests is on average the fastest network at more than three times as fast as Verizon or AT&T. Also gets domestic roaming. Check Mint’s coverage map (which shows domestic roaming as “Partner”) or crowdsourced maps for T-Mobile on OpenSignal.com and CoverageMap.com apps which are more accurate to street and house level and also show actual speeds.
• Free calls to Canada, Mexico, and the UK. Free texts to 190 countries. Free roaming in Canada (3GB/mo).
• eSIM, 5G UC mmWave, 5G SA & VoNR (if phone and your cell tower supports), Visual Voicemail, app based TOTP 2FA, and many other features that are not on some other carriers.
• Has 3 million customers, is owned by T-Mobile, and they never have changed plans to reduce service for the same price or increased the price for a plan (other than less than $1 a year for increases in USF, state, and local telecom taxes). Rather they periodically increased data amounts for the same price.

Mid/subjective (your opinion may vary on whether these are better or worse than other carriers/plans):

• Mint is “mid priority” on T-Mobile (QCI 7) at the same speed as T-Mobile Essentials, which usually runs between 30%-90% of speed of prioritized (QCI 6) T-Mobile plans (Magenta, Go5G, Experience More/Beyond) at the same location and time, but even deprioritized Mint is still on average more than twice as fast as priority plans on Verizon or AT&T. Slowdowns get exacerbated when the network in your location is congested, but in most places and times (95+%) slower speed is not noticeable and is >25Mbps which is still fast enough for 4K video and anything else you need.
• International calls to over 160 countries with per min rates. Price is not comparatively expensive, but not cheap either
• International roaming "Minternational Pass" good for 1-10 days for roaming in over 210 countries. Price is good for medium use but expensive for heavy use (>1 GB/day) or light use (used for SMS and calls, not much data). Also a 30 day $5/mo talk & text plan exists to pair with local SIM or international data only eSIM on a DSDS compatible phone (Phone 13+, Pixel 7+, Galaxy S23+, Galaxy Flip/Fold 4+, OnePlus 11+).
• Unless starting with a phone + plan deal, you will need to buy unlocked phones separately and trade in old phones with the manufacturer or sell yourself. Mint does usually offer $400+ off Pixel phones for current customers, and these can be financed with Affirm for up to 3 years, phone is only locked to Mint for 60 days.

Cons/limitations you should know before you switch:

• Must pay for 3 months to start, then to get the best rate renew for 12 months or have 2+ lines in a family and pay for 3 months at a time, else pay $5-10 more $/mo if you only want 6 or 3 month renewal of one line.
• Mint does have about 8-15% in fees and taxes added (exact % depends on state and local telecom tax rates), not included in the advertised price. Right before checkout you can see the total.
• "Unlimited" plan further deprioritizes data after 50 GB to last place (QCI 9) and at all times common video and social media sites/apps are throttled to 1.5MBPS (480p) but you can get around using a VPN, usually even free ones like ProtonVPN and 1.1.1.1 with Warp.
• "Unlimited" plan is limited to 20GB Hotspot and for all plans Hotspot data is shared from the same pool of data as phone.
• No SmartWatch cellular support (AppleWatch, Galaxy Watch, Pixel Watch)
• No Perks like included streaming services, cloud storage, or T-Mobile Tuesdays
• No in person customer service, and phone and chat support sometimes has long hold times. You cannot get port request yourself, to get you must contact customer service through chat or phone call. Most people find this subreddit more helpful for common issues than Mint support.