It's not uncommon for frustrating bugs to surface on major OS upgrades, and Apple's iOS 7 is no exception in this department.
The bug in iMessage, which is a free messenger service for iOS users or a typical SMS for non iOS recipients, appears to send but shortly after shows a red exclamation mark indicating that the message did not go through.
Annoyed iOS users took to Twitter and Apple discussion forums to report the bug, and workarounds soon surfaced. The easiest solution discovered by users is to simply restart the device. Another option being suggested is to disable iMessage, reset the Network Settings, and then turn iMessage back on. (To reset the settings, go to Settings → General Reset → Reset Network Settings.).
Apple said in a statement:
We are aware of an issue that affects a fraction of a percent of our iMessage users, and we will have a fix available in an upcoming software update, in the meantime, we encourage any users having problems to reference our troubleshooting documents or contact AppleCare to help resolve their issue. We apologize for any inconvenience this causes impacted users.
iOS 7 was released on Sep. 18th and since then users have complained about excessive battery use, typed letters that don't appear on screen and Apple’s Siri voice-recognition service not recognizing requests, as well as a security hole that allows access through the lock screen.
Apple released an update that fixed some of those issues recently, but now "a fraction" of users will have to wait for another update to fix those pesky iMessage issues.
Via: The Verge