05-31-2022, 06:41 PM
AT&T has begun whitelisting phones which I suspect was the problem with OP. The pinephone is not an "approved" device for them so they block the sim. The iphone sim worked because it thought it was in an iphone.
Tmobile does not whitelist, so as long as a phone has volte it should work.
Tmobile does not whitelist, so as long as a phone has volte it should work.