Imessage for ipod touch ios 5: message send failure

My ipod touch (4th generation) which runs on ios 5 sometimes send messages but most of the time i receive a message send failure notice.

I have tried changing my DNS to 8.8.8.8 and 8.8.4.4, resetting my network settings, restarting the phone, restarting imessage, turning off and turning on wifi.

It will work for maybe 10 minutes and then it will stop working and the cycle will repeat itself.

I have no idea what to do if you have any clue please help me, I would really appreciate it.

Thanks 🙂