AT&T Store at 663 West 49th Street, Hialeah, Florida.

I’ve visited this place several times to buy phones, change, add or exclude a line. They service has normally been quick and they’ve always treated me fairly. The clerks there are a bit childish and distracted but I wouldn’t expect much better. Overall, given my experiences, they work well and solve most problems fairly quickly. If they can’t do it then they’ll sit next to you with customer service on the line to help.