The account has been disconnected/ how to connect outside the U.S.

Yes the minute plan is still prepaid but you still have to keep a positive account balance to keep the account open. If all you did was change plans but didn’t refill your account and it’s been more than 60 days, your account is closed.

No, there is no issue with leaving a $0 account balance and letting your account close. That is how prepaid is normally cancelled. You can open a new account with a new number and new SIM card whenever you do return. You just can’t get that number back.

Accounts are blocked from access outside of the US and prepaid don't roam out of the US except for a couple countries,

Pre paid Support for travel abroad

+1.408.962.1025

there is no email for customer service

Could you please tell me how to connect Customer Service outside the US?

Account disconnected typically means the account has been closed. A prepaid account is automatically closed if the account balance is $0 for more than 60 days. If your account has been closed, it can’t be recovered. No point in contacting customer support. However, account access is blocked from most locations abroad. If your account is still open but you just can’t log in, the only way to refill or make changes is to call. Call the international support number.

I actually changed from the prepaid plan to the minute plan because I am not in the US and not use the AT&T phone number currently. Does the minute plan still count as the PrePaid plan? Thank you for answering. 

Thank you so much for answering!  I can not back to the US in the future year. Could you please tell me Is there any negative influence it brings to me? (such as bad credit history and can not have a new phone number in AT&T company) 

Thank you so much for answering! Your answer is really helpful to me.  Have a nice day!