No idea why people would want the 3G version to be honest. Don't any of these people have smart phones with 3G/4G plans?
Do what I am going to do for on the go gaming and browsing, just put that phone into tethering mode and connect to it's 3G connection via WiFi on the Vita.
I can't connect my Wii to the internet right now because my router uses protection that the Wii somehow is non-compatible with, so when I need any kind of internet I just place my phone into tethering mode and connect the Wii to it instead.
iPhone = Great gaming device. Don't agree? Who cares, because you're wrong.
Currently playing:
Final Fantasy VI (iOS), Final Fantasy: Record Keeper (iOS) & Dragon Quest V (iOS)