I always get an error when sending text messages. However, other person does get the messages.

Maybe Apple can explain why the phone in Settings > Apps > Phone can’t be changed, @ritzv2.As per the community article, anetwork reset can sometimes fixthis issue - your iOS user guide explains all the reset procedures for your iPhone.

And reset network settings worked. Thankswonder why sim replacement and restart did not work. Some glitches i guess in the number swap as i did not have to do this when i last changed the sim.anyways, thanks again

my text messages always comes back as not sent

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