iMessage not activating

[Belloni]

Trying to fix my girlfriends iPhone 4s, I have the 4s too and mine works fine I've tried everything to fix her, resets etc it says unable to verify but when I go to use apple Id I sign in but nothing happens just takes me back to the log in part ... It says iMessage activation an error occurred during activation

 

[Belloni]

Eurgh this iOS 5 is really grinding on me, very close to switching to the Galaxy Nexus soon unless they update it.

 

[Belloni]

Which parts are grinding on you?

It's the battery life mainly just so shocking and I've swapped one in store also.