Officially we cannot support unlocked iPhones to work with Push Notifications.
However some of our users have reported that they can get it working by doing the following:
This method has not been checked by ourselves and neither can we give any support for it but we thought we could include this information on our forum for those of you who wish to experiment:
Using something called Cydia for 'unlocked/jailbroken' iPones.
Download "BeYourIphone" and then "Push Fix"
We do not condone using this method and cannot be held responsible for any issues caused.We would always recommend using an officially activated iPhone with iTunes for the best expoerience.
I am sorry if this post has not helped. It is all the information that we have right now. IF anyone out there has a better solution please post it up or email it in to us.