Not sure if this is related, but AT&T apparently executed their 3G shutdown very poorly, which initially caused many users to lose calling ability, even on VoLTE-enabled phones: AT&T/U.S. Users: Please Read
Not sure if this is related, but AT&T apparently executed their 3G shutdown very poorly, which initially caused many users to lose calling ability, even on VoLTE-enabled phones: AT&T/U.S. Users: Please Read