I've had no problems with the iPhone 4 from Verizon except for the fact I can't get the MMSC, APN, and proxy to set up swirly MMS from the cydia store.
I've called verizon and the tech'i won't give me them. I absolutely loved that app and I can't get it activated without the MMS settings.

Unless someone knows how to send MMS with attached picture and audio at the same time.

Thanks in Advance,