A Visual Guide to 700 MHz

Although it looks "limited" on a map, it includes practically all metro areas in the country.

Still, it is hard to imagine them launching a really major technology that excludes most rural regions and even whole states.

I would guess that they will use it to add capacity, so yes, at some point I'm expecting to see 3G (or 4G) devices that work on all three bands: 700/850/1900.

There are other options, though... Unlimited service is all the rage these days, but it's being driven mostly by the expansion of Cricket and MetroPCS, who do focus on specific cities with their coverage. Therefore I suppose AT&T could launch a sub-brand that offers unlimited service on its own 700 Mhz network (and end unlimited under the AT&T brand in a few years). I'm not sure that specific idea makes sense, but it's an example of the kind of things they may be considering.

They could also launch a separate WiMAX broadband service that's not necessarily intended for phones, as Sprint is doing.