3G why ?????
I have an original version of iPhone, cracked to work on any network, I travel all over Europe every month, it works great for e-mail, an absolute breeze.
I also have a 3G data card for my laptop (also Apple), there is so little functioning 3G everywhere, that you will be incredibly lucky so ever see in improvement in data transfer speed.
Personally, I will be upgrading my existing iPhone software to version 2.0 for working on any network, and I don't care about 3G as higher speed is a myth.
I have had cellphone since the technology started (Motorola mobile Brick) and all kinds of smartphones, the iPhone outshines them all.