Remember that there are many communities that piss and moan that " I don't want another tower sticking up like an eyesore in my neighborhood " Then when coverage is not up to their expectations, lo and behold they have another reason to whine like little brats...... AT&T and Verizon were the 1st two to get their service into many areas so their was not much of a choice. Now that Sprint, T-Mobile, MetroPCS and some others came out, the carriers are stuck to major metro areas and highways.
That's entirely untrue. Do you really think they go in and build new towers? NO! They piggyback on existing ones.
It's much more cost effective for Sprint, T-Mobile, Metro and the like to use roaming agreements as opposed to building their own native networks outside of major metropolitan areas.
One thing is certain, if you're not going to travel outside of most reasonable sized cities (note I didn't say major) often, Metro's new coverage map is impressive. If you need to roam on occasion, you do have the option.
Then you should attend local town meetings and listen carefully when this issue is brought up. Metro piggy backs off of Sprint in their Extended Home areas. It's not about new towers at all. It's about people that are never pleased with anything.