Putting AT&T-frequency radios on previously-T-Mobile towers is a relatively low-cost possibility that would help with AT&T reception/bandwidth, although that will probably have to wait at least a year or so until the back-end routing systems are merged.
That's true. I imagine the regulatory hurdles to add radios to existing towers is orders of magnitude lower than building new towers. Might be a win for AT&T in cities where T-Mobile has good coverage.
