I just upgraded to an Unlimited Data Plan, and got an and a free iPad 9th Generation at that time. I have done everything I needed to do in order to set up both devices, but many of my non-iMessage texts "failed to send" over and over
I narrowed the problem down to MMS; if I turn MMS off and just use SMS, the texts go through, but if I turn on MMS and try to send a picture or GIF, I get the "failed to send" and red exclamation point.
I see similar issues on the message boards here, but all of them reach a dead end with a "We're sorry to hear you're having a problem..." response. I'm hoping that I can get some help on what to do.