With my iPhone 5 with iOS 7.0.2 on Wifi or on 3G my iMessages won't send (Progress bar stuck in the middle of the screen).
Rebooting or Airplane mode won't change anything.
IOS – iMessage won’t send on iOS 7
iosmessages
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Best Answer
There seems to be a bug with iOS7 :
To make it work again here is a procedure :