I've been with AT&T since they were Cingular. However, I've been heavily considering switching to T-Mobile with their $100 2-lines, 10GB per line and music streaming is free deal. Was about to make the switch, but was still concerned about coverage...so I thought I'd call AT&T to see what they would do for me. I'm on the Family Share 15GB plan and we pay $130 per month for that. (My wife & I each have a 6S though the Apple Payment Plan.) I simply asked for the retentions department right off the bat and was transferred. Told the rep what I was thinking about doing and she immediately offered to bump our plan to 20GB shared per month and a $50 bill credit. Couldn't offer the $100 per month, but that was what she could do. I figured for the assured coverage...I'll stay put for now. The data is rollover so I'll be all set there (the most I've used in a month is 13GB and that was a rare month that I travelled...wife uses around 1.5GB) and the $50 was a bonus.