Dear Kien, Thank you for taking the time to e-mail AT&T to request the device unlock code for your iPhone with IMEI ending with 21521313. My name is Terrance Taylor, and it will be my pleasure to assist you today. Unfortunately, non-AT&T customers are not eligible to have their iPhone unlocked through AT&T. 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. · The iPhone has not been reported lost or stolen. Also, current customer accounts must be in good standing with no past-due amount or unpaid balance and has been active for at least sixty (60) days. Former customer account may be eligible for unlocking so long as you do not owe AT&T an Early Termination Fee or an unpaid balance. AT&T will unlock an iPhone for an active and deployed member of the military who is a current AT&T customer in good standing and is able to provide AT&T with deployment verification; and a person who purchased the iPhone from an authorized location at the 'no commitment' price and can provide proof of purchase If you are a current or former AT&T customer, please respond to this e-mail providing your phone number or account number for the account. Once this information has been verified a device unlock case will be submitted. Once the case is resolved, we will be attempting to contact you by email on or before the close of the next business day Monday through Friday. This would be 9p.m Eastern Time, 8p.m Central Time, 7p.m Mountain Time, or 6p.m Pacific Time. We want to ensure that we provide you with total resolution for your concerns. Thank you for your patience. Kien, I hope that the information provided has been helpful and has resolved all of your questions. Should you have additional concerns or questions about this issue please reply to this email. If you need to contact us again regarding a new issue please send us another email. I encourage you to visit our web site (http://www.att.com/wireless) often to shop for new product and service offerings. Sincerely, Terrance Taylor AT&T Online Customer Care Professional Help AT&T improve our service to you! Please complete our short survey about your e-mail Customer Service experience. Click on: http://www.wireless.att.com/support...&state=promptVote&id=ccgaTT1701***21521313*** The information provided in this e-mail is intended for the view and use of the authorized AT&T subscriber only. Content may not be shared or relied upon by third parties. AT&T, at its sole discretion, reserves the right to amend, modify or replace the written content of this message to correct or update answers provided to Subscriber. No term of Subscriber's Customer Service Agreement is altered, waived, or modified by this message unless expressly agreed by an authorized AT&T representative. (c) 2010 AT&T Intellectual Property. All rights reserved. AT&T, the AT&T logo and all other AT&T marks contained herein are trademarks of AT&T Intellectual Property and/or AT&T affiliated companies. All other marks contained herein are the property of their respective owners. Mấy bác pro ơi giúp em . Lúc em gửi mail cho at&t thì nó trả lời như vậy. Giờ phải làm sao đây ???