Just as subject says – I upgraded to Android 11 on my 4a last night, and I didn’t realize until just now that none of my calls or texts have come through. Calls went straight to voicemail and texts never arrived. Upon realizing this, I rebooted the phone and thankfully all my texts that had been queued up came through, and calls now ring properly. Hopefully this was just an upgrade glitch that got cleared with a single reboot and not something that continuously occurs and requires regular reboots to clear each time. I’m on T-Mobile, in case it matters. Anyway, I figured I’d post this here in case others come across the same issue.