Hello @Giacantu83,
I’m sorry to hear you lost your phone. On top of the lost phone, not being able to manage your account is troubling! I would be happy to help you with this today.
We have a helpful article which explains how to manage your AT&T passwords, including resetting your password. If you have already tried these steps without success, we may need to reset your password another way.
I will be sending you a private message to your Forum’s Inbox requesting more information. Please be on the lookout for it.
I look forward to hearing from you, and please have a fantastic day!
Jessica, AT&T Community Specialist