You guys (rab777hp and jonathan) are joking, right? There is no way that can be done in the current config. h/w and s/w wise. The VZW iPhone doesn't have the front end parts for UMTS at all and you can't just connect some ATT iPhone front end to it cuz the interfaces and architecture used by the 2 phones aren't compatible. Besides, the s/w (protocol stack & firmware) for UMTS are not resident in the VZW iPhone version. Once again, you can't just borrow firmware from the ATT iPhone and try to shove it into the VZW version. They are simply not compatible between the 2 phones. The most one can say from the choice of this chip is that Apple is positioning itself to use this chip as a reconfigurable modem (at the time of manuf.) to support CDMA and UMTS when the iPhone5 comes out.