T-Mobile and Sprint merged into one company in April 2020, but Sprint̵
Phones with Voice over LTE (VoLTE) support will continue to work with T-Mobile and Sprint. This change only affects old CDMA devices that do not have 4G LTE support. If you see an LTE icon at the top of your phone, you are fine.
It looks like CDMA Shutdown Day for Sprint is 1/1/22 or thereabouts, according to this letter I got from T-Mobile.
I’m curious how much of Sprint’s LTE network will be online at that point. If you bet that on 1/1/22, it adds up to the PCS G block plus B26. pic.twitter.com/dMan26HLox
– Ian Littman (@iansltx) December 27, 2020
But if you’re nostalgic for your old Nexus, you better start using it now. T-Mobile and Sprint will stop activating CDMA phones on January 1, 2021. You must activate your old phone before 2021 if you want to use it for a year last year.
We would expect more legacy networks to shut down as carriers switch to 5G. T-Mobile and Verizon plan to shut down their 3G networks by January 2021, with AT&T aiming to end 3G service in early 2022. The average person won’t notice that 3G is gone, but people using older devices will upgrade.
Source: Ian Littman via Android Police