There is no 3g situation in Afghanistan. I think it's funny they mention deploying an Army 3g network, since there are no data-links anywhere in Afghanistan operating at 3g speeds. Not at Camp Eggers, not at KAIA, not at ISAF HQ. There are no operational fiber lines out of Afghanistan. It's all satellite, and it's high latency and relatively low bandwidth. I pushed through a bandwidth upgrade for one of my facilities. The average cost for a satellite internet connection there is $10,000 per megabit per month. So our new 6 megabit connection cost $60,000 per month. And that was 6 megabit burst speed.
The cellular network is technically edge, but you can expect 10KB\s on average in the major metro areas (Kabul, Kandahar City.)
I just don't see what they think they're going to accomplish with smart phones. The network to support them doesn't exist. It sounds like they would be better served by PDA devices, which are already heavily utilized in all fields of the Army. You can load apps on them, they have wifi and they're rugged enough to use in the field.