Why is imessage only working on wifi?

Hi,
I'm having some trouble with iMessage on my iPhone 4.  For some reason since last week it will only send/receive messages when on a wifi connection but not on 3g/Edge.  None of my data settings have changed.  Coincidentally I've found that viber is having the same issue, it will only sned/receive message on wifi but not on 3G/Edge.
All the other browsing apps/safari work fine on 3g/edge.  Does anyone have any ideas? I'm based in Ireland on the O2 network
Thanks in advance.

Yes same here.
The apps "Find My iPhone" and "Find My Friends" are doing the same thing, work fine in wifi but not on 3g/Edge. I'm in Australia on Telstra.
It's my wifes 4s that worked fine when I was using it, my 5 works fine.
It's software based because changing phone and restoring have the problem folling that user!

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