If by build their own towers, you mean put up their own poles with antennas on them, then yes. Definitely. If however, you meant : does cricket buy time with other networks like the big guys do to provide "nationwide network" calling plans, except perhaps only in crickets metro area? then no, they do not. In the area cricket covers, you will never use another wireless companies frequencies or network. in non-cricket areas, cricket does now offer a roaming option which you can pay per minute (5 dollars from your flex bucket for 30 minutes) and allows your phone to roam on other providers networks. it can be used nationwide in the us, as well as in some parts of canada.