MMS option disappeared from Settings
I cannot send images with a text to some users and the MMS option in settings has disappeared. This always happens after a software update.
iPhone 11, iOS 15
See especially item 4 under “try these steps first” here. It seems likely you’re dealing with an offbeat cellular carrier, or have your iPhone somehow managed by an external party.
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
