Does At&t Allow Unlocked Phones. Enjoy nationwide 5G connectivity on. The U1 versions which were sold factory unlocked do not perform that trick and remain an unbranded unlocked phone that will not work with ATT VOLTE or Wifi.

And all unlocking does is allow your phone. That list is a joke ATT does not allow unlocked phones on purpose when I had them in 2018 my pixel 2 would always be on 3g while on a call so I finally got tired of it called tech a few times finally talked to a rep with some common sense he changed the IMEI number of one of the att branded phones I had volte just like that he said once the system pulls your info on your phone and registers it will stop. It can be hard to tell which networks are supported by unlocked phones.
Service capabilities for your unlocked device Punkt Model Network service MP 02 HD Voice PepperlFuchs Model Network service Smart Ex-02 ROW HD Voice OnePlus Model Network service Nord N200 DE2117 Nord N10 BE2026 Nord N100 BE2011 BE2013 BE2029 9 Pro 5G LE2125 9 5G LE2115 8T KB 2000 KB2001 KB2005.
Still that list claims the unlocked S10e is. You can also bring your own device BYOD to ATT PREPAID SM. Its not built into the firmware as a usuable option unless its preloaded with the ATT version of the firmware. Google Amazon Verizon and user-distributed just to name a few.
