iOS 8.4 imessaging doesn't work
I Updated my iPhone 6 to the 8.4 iOS. Now iMessages aren't working. Help!
iPhone 6 Plus, iOS 8.4
Did you already try to reset the phone after the update by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data by resetting. Then check the settings for iMessage again in Settings/Messages.