AT&T Microsoft Lumia 640 LTE question

Is this phone unlock supported by BEST or credit option? Want to be sure before buying credits if need to.

AT&T Microsoft Lumia 640 LTE
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Model: Lumia 640 LTE (RM-1073)
Sw Version: 02177.00000.15184.36016
Product Code: 059X0B8

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AT&T Microsoft Lumia 640 LTE question