I have been having trouble delay receiving (sometimes up to 12 hours and all the messages come in at once after the 12 hours) group text for a couple months. This has been on going and I called Apple and T-Mobile for the last couple of months. I changed out a new sim card. My group text only includes 2 other people, one is an android phone on T-Mobile service and the other is an iPhone 7+ with Verizon service. I restored my phone and still having the same issue. I called T-Mobile and they keep creating trouble tickets and escalated to their engineers. T-Mobile also did a purge on my account and still an issue. Still they said they don't see anything wrong. I contacted Apple and said it is on T-Mobile's end. I have been a T-Mobile member for at least 12 years, I would hate to go to another provider. But, what is the use of paying for a service that does not work.
Best answer by tmo_chris
We are changing the way we are tracking and recording this issue. Please contact us with the following information so that our tech support folks can open an engineering service request.
3 examples less than 24 hours old of when a message that was sent via a group message was delayed.