ZTE 831 at&t phone needs previous owners email it will not unlock without it?

SOURCE: unloc telstra phone zte f165

network code

SOURCE: ZTE PHONE UNLOCK

Get your IMEI code, call your provider for it's location. Advise that you will be traveling out of the country and you need your phone unlocked. As long as you are a customer in good standing and your bill is up to date, you will be given an unlock code specific only to your phone NOT any other phone of the same type.

SOURCE: How to install zte 831 aii Broadband modem in Linux with USB

I was working at one of Lithuanian internet service providers. We often had clients complaining about ZTE 831 connecting through USB. The answer is - use a LAN card. Sorry.

SOURCE: i forgot my code that unlocks my metro pcs zte phone

You can try all zero's (Example: 000000, 0000). Now since your device already has a custom unlock code, more than likely you will need a customer service representative of MetroPcs to assist you, where such information can be accessed.

SOURCE: remove previous owners email address

Your BlackBerry Internet Service or Web Client account can be integrated with up to ten email accounts. The accounts that are supported are POP3, IMAP, Hotmail, Yahoo, and Gmail. If for any reason you wanted to remove an email account do the following:
To remove an integrated email account:
1. Connect to the BlackBerry Internet Service web site and log in to your BlackBerry account.
2. On the navigation bar, click Profile. In the Profile list, click other email accounts.
3. Under the Email Accounts list, check the box beside the email account that you want to remove.
4. Click Delete. You will be prompted with a warning message. Click Yes to continue. This will remove the integrated account from your BlackBerry Internet Service account.