Why can't I send text messages on my iPhone?
Am unable to send text messages.
[Re-Titled by Moderator]
iPad Air, iPadOS 18
Without more information, that's a very hard question to answer. What iPhone do you have? What version of iOS are you running? Are you having a problem with iMessages (blue) or SMS/RCS (green)? Or both? Are you getting any error messages? If so, what do they say?
See also:
If you can't send or receive messages on your iPhone or iPad - Apple Support