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Your argument seems solely based on the quality of their network, and while I do agree their overall data network is superior to the competition, their voice coverage is still nowhere near the level of quality or reliability of Verizon's. There will be areas (like the major cities you've mentioned) where the difference is negligible, but you will certainly see the difference as you continue to explore other rural areas. Take a road trip across the country with your AT&T phone and you'll understand exactly what I'm talking about.
I do still have a problem with AT&T though, but it has nothing to do with their network. I'll never be their customer again as they have been the most aggressive and unrelenting force against their customers in the entire industry. They've treated all of their shortcomings as a way to generate additional profits for themselves and never had any shame in doing so as they went. I can cite multiple examples as necessary. There's a reason they've been at the bottom of Consumer Reports for the past two years in a row.
1 year ago on Got A Problem With AT&T? Wake Up, This Isn't 2008 Anymore