My messages on iMessage aren't sending. I decided to turn off iMessage to see if I could then turn it on again to fix the problem. When I then tried to turn on iMessage- it refused. It displayed an error message reading: "iMessage Unavailable. Turn On cellular data or use WiFi to set up iMessage.” My cellular data/WI-FI is on, however. Therefore I do not know what to do about the problem. I have tried re-booting my phone. It hasn’t made a difference.
I’d appreciate some help with this issue. Thank you in advance.