I’m lucky I have a Consumer Reports subscription so I can tell you what they found when they rated cell phone service in the US. I’ll give you the bottom line, for the details, buy a subscription.
1. In overall ratings Verizon was the best in every category. AT&T was the worst in every category but one (whether or not an issue was resolved, for that only Sprint was worse). The order was: Verizon, T-Mobile, Sprint and AT&T.
2. Consumer Reports also rated service by city. Verizon was top-rated in every city. There were some cities where AT&T wasn’t worst. For example, in Dallas AT&T was #2. Other cities where AT&T didn’t come in last: Boston (3), Detroit (3), Indianapolis (2), San Antonio (3), St Louis (3), Tampa (2).
In these cities AT&T did come in last: Atlanta, Charlotte, Chicago, Cleveland, Columbus, Denver, Houston, Jacksonville, Las Vegas, Los Angeles, Miami, Minneapolis, New York, Philadelphia, Phoenix, San Diego, San Francisco, Seattle, Washington DC.