AT&T is suffering huge congestion problems because they
built out their network on the cheap, compressing the signals to hell and back to cram more calls and data onto fewer towers. AT&T sound quality is horrible when compared with Verizon, Sprint or T-Mobile. They may advertise they have "the fastest 3g network" but that network is spread so thin we all get to suffer together.
There is no reason we can't have net neutrality on wireless networks and let carriers manage their growth with data caps. What we are getting instead is a wholesale land grab from carriers who want to privilege their own content or that of their "partners". Once you dominate a market and control the pipes that deliver that market, all the net neutrality principles in the world won't give your competitors a fighting chance. The damage will have already been done. Don;t think for a second that Google and Verizon aren't keenly aware of this fact.