What can I do to fix it?it is your service from the network provide, I meant carrier, not the iPhone
Have a strong connection, you need to talk to your carrierWhat can I do to fix it?
Switch a carrierI would say contact your carrier and tell them to refresh your data signal.
Followed by a “failed to send” message. What is going on here? iPhone 12 Pro AT&T. When I turn on WiFi it immediately works again.