The IMEI you entered does not appear to be an AT&T wireless phone or tablet.

Hello there @achuma,

Thanks for joining us here in the Community Forums! When you wish to unlock your device from our network, the benefits can be numerous. I would be happy to assist you further on this. 

Although you tried different browsers, I also like to also recommend clearing cache and cookies. If you are still receiving the error message, I will go ahead and follow up with you through the private message you sent me. Please expect this in your inbox.

Have a wonderful day and I hope to speak soon!

Shenoah, AT&T Community Specialist

I need help please.  Having the same issue with imei number

I have an iPhone that is locked to at&t network, it can be activated with only at&t sim card and it does not accept any other. I am not able to unlock it since I can not even post an unlock request because when I insert the imei, it shows that it does not belong to at&t, please help

Prepaid phones IMEI are purposely not in the unlock system.  Until the phone is used on ATT it will not show in the unlock system because it MUST be used for 6 months to be eligible for unlocking.  

All prepaid carriers sell phones below retail cost.  Because of this, they are allowed to lock 

phones for up to 12 month.  

In the past ATT did not require phones be used before unlocking.  That loop hole is CLOSED.