Try this, click on Menu>Settings>About Phone>Hardware Information. Check your 4g MAC address. If it says 00:16:08:00:24:05 then you have a bad MAC address and it needs to be changed. Instructions on doing this are
here and you must be rooted using
Toast.
I am currently in this same boat and I have to reroot using Toast since UnRevoked doesn't have some of the features needed to modify the mac address. Good luck