ATT Unlock iphone device/sim

I wanted to unlock my iphone so that I can use other carrier's sim, ATT has this online form 
where you can simply submit the request online and you will receive the instructions once iphone is unlocked.

Here is the eligibility requirement to unlock iphone:

General Eligibility Requirements for Unlocking iPhone

AT&T will unlock an iPhone under the following circumstances:

• The person requesting the unlock is:
  • a current AT&T customer or
  • a former AT&T customer who can provide the phone number or account number for the account
• The iPhone was designed for use on AT&T's network;
• All contract obligations, including any term commitment, associated with the device to be unlocked have been fully satisfied; and
• The iPhone has not been reported lost or stolen.
• 
  

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