> If you have purchased a recent smartphone directly from AT&T or T-Mobile, then you very likely have nothing to worry about here. However, if you’re using an unlocked device or a device on a custom ROM, then you’ll want to pay attention to what’s coming. Since AT&T whitelists devices for VoLTE compatibility, you won’t be able to BYOD to the carrier starting February 2022 unless the carrier changes its practices or whitelists a lot more devices.
https://www.xda-developers.com/t-mobile-att-require-volte-ph...
> If you have purchased a recent smartphone directly from AT&T or T-Mobile, then you very likely have nothing to worry about here. However, if you’re using an unlocked device or a device on a custom ROM, then you’ll want to pay attention to what’s coming. Since AT&T whitelists devices for VoLTE compatibility, you won’t be able to BYOD to the carrier starting February 2022 unless the carrier changes its practices or whitelists a lot more devices.