An International Mobile Equipment Identity (IMEI) is used to uniquely identify GSM and iDEN devices on a network.

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how you can lose / keep IMEI over after factory reset?

Here it says as a solution for a type of a phone. There are other question ( upvoted) but closed by somebody marked as to localized. Of course it is localisez for each type... why don't want to allow ...
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Invalid IMEI after factory reset

After factory reset my phone starts showing "Invalid IMEI" on both sim slots and I can't call or be called. What might be the problem? Android version; 2.2.1 , model: A601
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how do i fix the imei problem my phone dispays invalid imei [duplicate]

Possible Duplicate: How to fix “Invalid IMEI ” after Factory reset? The phone is a g tide A702 dual sim with Android v2.2.1, MTK Platform I get an Invalid IMEI error after a ...
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IMEI = NULL in Samsung Galaxy Note 3

I have a Galaxy Note 3 FM-N9005 which had base band version N9005ZHUDMJ9 and build number JSS15J.N9005XXUDMK2 running on jelly bean 4.3. I searched for its latest firmware on Sam Mobile and there was ...
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How does IMEI Survives Data Reset

NVRAM Remains in data partition. Then why IMEI is not lost after data reset?