I just upgraded to the iphone 4 last night and had everything transfered over but I keep getting a pop up that says I am unable to activate the cellular data network when trying to go on the app store and safari. Just wondering if anyone can help me out. Thanks.
When you say you "had everything transferred over", it sounds like you ported in from another carrier... it may take a few days for the port to complete and for everything to start working properly.
It's been a few days since your original post - have things resolved?