When your ATT account gets hacked and you are unable to get it back, you should try to reach experts. Well, if your email account is accessible then immediately you should change the password. But if you are unable to access your ATT mail then dial AT&T customer support number 1-800-234-6190. This is a toll-free number that is 24x7 reachable for its users. On the call, experts will try their level best for resolution of ATT mail.