It seems that ever since AT&T lost the exclusive rights to sell the iPhone in the US, they have been doing some very strange things to build revenue at what appears to be the expense of their customers. As the end of the arrangement with Apple was ending, they finally started offering free microcells to customers as a way to get them to stay. They did not do this to all iPhone customers, only to some. When iPhone customers called to cancel their service on their way to Verizon, they were offering unlimited data to them as an effort to get them to stay. They did not do this weeks before the Verizon iPhone launch as they should have.
Then the next item they did to build revenue was a decision to no longer allowed online only stores to sell their phones which impacted many such as Wirefly. While these online companies often sold the phones at a discount, AT&T added customers with new 2 year contracts. Then, they decided that their broadband home users where downloading too much data over DSL or the new U-Verse and changed from the basically unlimited usage to a new cap of 150 GB for DSL and 250 GB for U-Verse. All of these actions do not welcome their existing and future customers. Knowing all of these items, why would anyone consider going to AT&T.
Now, we are hearing that AT&T is cracking down on customers of iPhone and Android OS mobile phones who are tethering their phones to get data to other devices. While AT&T has every right to do this, it does appear they are becoming heavy handed. The phones that are doing this have been altered either by a jailbreak (iPhone) or rooted (Android OS) to provide the unpaid feature to them. This does provide a revenue stream for AT&T by basically telling them to stop or they will be added into the $45 per month plan for data usage.
While AT&T is legally able to do this, it does appear they are encouraging people to leave AT&T and go to other providers. This includes their DSL and U-Verse. So if you were an AT&T iPhone user who was complaining about service and they did not offer to do anything until you were in the process of canceling your service, you would not be happy. If you were an AT&T iPhone user who had really bad reception and they did not offer you a solution of a microcell until just before the launch of the Verizon iPhone, you would not be happy. If you are an AT&T DSL or U-Verse customer who has just learned that you are now going to be getting data caps, you would not be happy. If all of these things applied to you, you would be shopping for somewhere else to get your service.
It does appear that AT&T is less interested in keeping their customers happy and more concerned about getting money to the bottom line.