After updating to iOS 15.4.1, both our 11 Pro iPhones, and our 4 iPads, cannot iMessage either to see received messages or to send new ones. The app opens only to a blank white screen.
all these devices worked perfectly prior to the iOS update.
we have gone through every “fix” in the book, including while on-line with Apple support. Even did a reset of network settings, and a restore of the 15.4.1 update while connected to our iMac.
Our phone service carrier AT&T refreshed signals to both phones several times, they found no problems with our cellular service.
Our internet works fine as well, and the problem persists whether we are home or away from home.
also occasionally we get the same blank white screen when try to use the phone to answer or make a phone call.
None of these issues existed prior to the iOS 15.4.1 update.
Highly unlikely that 6 separate devices (2 phones & 4 iPads) which worked just fine prior to the same iOS update would suddenly fail right after — this must be something caused by the iOS 15.4.1 update.
Very frustrating