iMessage has suddenly stopped working
My iMessage was working fine up until yesterday when it stopped working completely. The phone I am supposed to be iMssaging still has iMessage yet my phone isn't even giving the option of sending as an iMssage now to this person, just a normal text message.
My iMessage is still switched on too.
We're both using 3gs. Any help?? Thankyou.
iPhone 3GS, iOS 5.0.1