• Facing Unusual Activity In ATT Account then quickly call at att customer service phone number If you are discerning any unusual activities in your AT&T account and those are not made by you then quickly call at att customer service phone number i.e. 1-833-276-4777. You should immediately tell the customer service provider regarding suspicious activities because if you will neglect it then it may lead to serious problems like account hacking, information transfer to an anonymous source, removing of email, etc. https://www.att-customerservice.com/