The only way to upgrade from 2G - 3G is with a physical hardware change which changes out the radios (cellular/PCS radios not the car radio ) Think of it just like your phone.
Originally Posted by Sophisto
So the Combox now is 3G, does this also mean the 2011 comboxes are upgradable to 3G?
2015 M3 - Mineral White, Sonoma, Exec, LED, Adaptive Suspension, HK, 19" Light Alloy, 6MT ED 7/7/15 - On Order w/Adrian
2013 535i - Space Grey, Biege, M-SPort, Premium, Tech, Cold Weather, Luxury Seating, PDC, 6MT ED-10/11/2012 - PCD - Greg Poland