Why won't iMessage work on my jailbroken iPhone 4?

I just got my stepmom's old iPhone 4. My dad had jailbroken it on iOS 5.1.1 using Redsn0w. Now whenever I try to activate/sign into iMessage or FaceTime, after about 15-20 seconds, and error pops up saying,"Activation Failed/Unsuccessful". My uncle has the same problem on his iPhone 4(jailbroken on iOS 5.0.1).Is there a way to fix this? I don't like always using my iPod Touch to iMessage.

I have a jailbroken iphone 4s and it works fine try using other network though for some reason when i use 3 network in England i don't get facetime or imessage either

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