I called AT&T and asked to add tethering to my phone, but made sure before making any additions, that I would not lose my unlimited data plan. I was assured that I wouldn't and my account was noted. One week later when I canceled the tethering (because it stinks), I was told that I could not have my unlimited plan back. After numerous phone calls, I have decided to cancel my account, after 10 years of service. Very disappointing experience. Their loss. Too many other companies out there to stress over AT&T's poor customer... read full review »