It seems a lot of users who upgraded to iOS 7 last month are having issues with iMessage. Apple’s Support Communities forums are full of complaints from disgruntled iPhone, iPad, and iPod touch users who cannot send or receive iMessages anymore, and you’ll find plenty of people voicing their frustrations on Twitter, too.
Initially it seemed Apple’s servers were the problem — as they often are when iMessage has problems — but that’s not the case. Instead, it appears to be a simple bug that can be easily rectified with a quick bit of tinkering. Here’s what you need to do.