Topics created by ovoropaev

@Keneda said in AT&T SIM does not work in the US:

For now your best option to be able to call in the US with a 4G device is to use SIP call, go to ubports north american telegramm group (ask from there https://t.me/ubports) for more info and to get the SIP app to install.

Session Initiation Protocol work when the phone is connected to the Internet. How I connect to the Internet without connection to local provider.
At home I have my computer with VoIP.
I have Android phone with 4G and it is work perfectly with AT&T SIM.