iphone error, message 'not delivered'
My family and I have had a 'not delivered' error message on the Message app when sending pictures. I made sure SMS was on, I have turned the message app on and off in settings all without success in stopping the error message. This can occur 75% of the time sending photos to family members. I have an iPhone 12 running iOS 16.4.1 ( up to date). we have AT&T carrier, the problem occurs on the home network and at work.