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I PAID OFF THE AT&T PHONE BUT IT DOESN'T UNLOCKED

I am using the AT&T network, a few weeks ago I paid off my iphone 8 plus to unlock this device in US. Right now I am travel to Vietnam, when I put into my Vietnam sim card I received the information like " Sim not valid". Please help me because I tried to contact AT&T service several times to unlock this device and they said my device approved to unlock.


My iphone 8 plus Imei is: 359401089204421 


Thanks & best regards,

Posted on Feb 15, 2020 6:56 PM

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Posted on Feb 15, 2020 6:59 PM

Have you followed the instructions at: How to unlock your iPhone for use with a different carrier - Apple Support

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I PAID OFF THE AT&T PHONE BUT IT DOESN'T UNLOCKED

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