Imessage wont send to one contact

[stemcp]

Hi

I have an iPhone 4S on Three, and my wife has one on O2. All has been fine until a few days ago, when we found we can't send iMessages to each other. We can to all of our other contacts, just not to our phones. I've tried hard resets, resetting network settings, turning iMessage off and on, but no joy
Any ideas?

 

[Pinkpoison]

i have had the same issue,last night i thought iMessage was down for a while,i found later i could message one friend ok but not my son who is on 02,messages to him were sending as texts,i'm on 3 too,i tried everything,couldn't imessage him from my mac or ipad either then it just suddenly just started to work again,very strange that the same networks were involved here.