How do I update my Samsung Galaxy S10+ with a baseband version G975USQU3CTB3 with Android 10 to Android 11 with One UI 3.0 and above?

I’ve had no Guide Info for days; Info Button has become useless. Have restarted the Gateway via the AT&T app without results. Must I restart everything manually to regain full service?

I've been an AT&T high speed internet customer since 2006. I recently requested a home phone service change to Digital Phone from analog land line phone service. I didn't expect to receive a new router/gateway, but AT&T has notified me that I'm about to receive one. I already have an AT&

I tried calling all the 1-800 numbers you provided and was transferred 6 times, waited on hold for 2 hours and today was on hold for an hour and STILL NOT resolve. ATT is giving me a hard time to cancel or disconnect my account. Trying this one, I HOPE THEY CALL OR RESPOND TO ME!