connectivity problem
no wifi and no cel data on my device. wifi works on other devices. texts still send. restart does not help, nor does resetting network connections. what other levers are there to pull?
iPhone XR, iOS 15
First try a Forced restart
Force restart iPhone – Apple Support (UK)
Check for airplane mode.
If no better
Backup, restore to factory, and test, then restore from backup:-
(If the phone needs attention you will have to do this anyway)
If you can import your media to Photos or iTunes in a computer and copy important documents to a cloud server it will give you some resilience in case the restore from backup fails, or you need to ditch the backup and start as new.
(1) How to back up your iPhone, iPad, and iPod touch - Apple Support
(2) Restore your iPhone, iPad, or iPod to factory settings - Apple Support
(3) Restore your iPhone, iPad, or iPod touch from a backup - Apple Support
If the phone fails to activate take the Sim out and put it back with the power on.
If it still has no cellular go straight to repair
If the original problem remains after setup then do step (2) again but set up as new without restoring any backup.
If it fixes it then it is probably a rogue app or setting
Otherwise arrange a repair
iPhone Service & Repair - Apple Support