Wirelessly posted (BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/-1)
The 8700* units will most definatly not be UMTS compatible. UMTS is effectivly a high level frame work for a signalling methind known as Wide Band Code Division Multiple Access or WCDMA. The hardware required for the PHY layer (or air interface) for gprs / Wcdma is completly different. So unless you believe that rim will launch a software upgrade that will somehow change the RF related internals, don't hold your breath.