Đây có phải thư unlock từ at&t ko ah?

CASE: CM20120417_39507676
MOBILE: Non-ATT
MANUFACTURER: Apple
MODEL: iPhone_4
IMEI: 012746005545045

Thank you for contacting AT&T Customer Care about unlocking your iPhone. We have reviewed your request and confirmed that you are eligible to have the requested iPhone unlocked.
To complete the unlock, simply:
1. Open iTunes on your Mac or PC and verify that you have internet connectivity.
2. Connect your iPhone using the dock connector to USB cable that came with your iPhone.
3. Backup and restore your iPhone using iTunes .
For information on backup and restore, please visit http://support.apple.com/kb/HT1414.
4. After restoring, your iPhone will be unlocked.
Additional information on unlocking can be found at http://support.apple.com/kb/TS3198.
For questions regarding AT&T’s wireless service and iPhone, please visit the Phone/Device Learning Center. We thank you for your continued business and look forward to providing you with the best customer service.

Thank you for contacting AT&T Mobility. We appreciate your business.

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vậy có phải iphone của e đã đc unlock ko ah? vì e thấy hơi kỳ là ip e mới mua hơn nữa mua trên ebay là hàng trôi nổi mà sao nó vẫn cho unlock nhỉ. và theo thông số ở trên nó cũng ghi là :Mobile:non at&t ??????