AT&T have reportedly started to roll out a new update for their devices, the Galaxy Express 3, and Galaxy Express Prime. The devices arrive with the build numbers J120AUCU2AQC1 and J320AUCU2AQC1 respectively, as the update brings MCC/MNC support for them.
Also, the update brings fixes for issues with VoLTE mute, RTCP jitter, and Rx audio. Also, the Android security level is now bumped to March 1. The update for the Galaxy Express 3 is 21MB, as for the Express Prime 428MB.