[Guide] Why my IMEI missing & NO network?

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Your IMEI (International Mobile Equipment Identity) is transmitted to the Network provider the moment you switch ON your phone

It is used by your Network to identify the following

1) The first two numbers is RBI (Reporting Body Identifier) = who registered that type of phone ( verify here )

2) The next four numbers is TAC (Type Allocation Code) = what type of unit and its complete specifications

3)The next two numbers is FAC (Final Assembly Code) = who manufacture it

example :-

01 AEG
04 Samsung
07 Motorola
10 Nokia
30 Ericsson
41 Siemens
50 Bosch
51 Sony

4) The next six numbers is the Serial Number of the Phone

5) The last number is sort of a check sum, that verifies the previous numbers

Combined a total of 15 numbers is used by your network to get the complete information about your phone that is used against their database of Blacklisted phones and final approval to connect to their network, IF they were inaccurate or had complaints (like being stolen, not paid telecoms dues etc) it will be rejected and BLOCKED immediately from connecting to that Network

You can verify all this by entering you IMEI here and here

And also here to check if it is blacklisted

Your IMEI is also needed for networks to BLOCK your phone when needed as well as ANTI theft apps.

Hence if your IMEI changes or gets lost, it may fail to connect to the network, depending on the restrictions of that network provider.

It is clear that Flashing custom ROMS can cause your IMEI to Change or get deleted as they may be ported from another manufacturer or from another version of the same manufacturer as the IMEI embedded in the chip of your phone.

IF you want to AVOID this problem, safe you EFS folder the moment you think of Flashing any ROM that is NOT the original Firmware for that phone

It is noted that to resolve this problem you have to return to its original firmware to recover your embedded IMEI and do a progressive upgrade . eg. from GingerBread to ICS before going on to Jelly Bean

For ways to resolve IMEI problems visit EFS Problems and Solutions or My Android Solutions


This post is linked to Pit Stop

I will add that information on their own IMEI number check here http://www.imei.info/

similarly, you can also recover your IMEI using this method: http://forum.xda-developers.com/show....php?t=1264021

nice jobe OP!

Good job in explaining what it is!

Confused

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Originally Posted by TotallydubbedHD

Good job in explaining what it is!

You have the FAC 04 as Samsung which is correct but, HTC is also 04

Originally Posted by mikaelel

I will add that information on their own IMEI number check here

I tested this site with my Nokia E71, and it's reporting my phone as Nokia 100

Originally Posted by awaaas

I tested this site with my Nokia E71, and it's reporting my phone as Nokia 100

My Galaxy S3 appears as a Huawei U7510 on http://www.imei.info/, but http://imei-number.com/imei-number-lookup/ shows the correct information...

Originally Posted by Taysider

You have the FAC 04 as Samsung which is correct but, HTC is also 04

I believe this is also possible as some of the manufacturers are using more than one FAC (Final Assembly Code) and some do have the same FAC....end of the day only the manufacturer would have chosen what they wish to use, on the other hand the checksum of the 15 numbers in total, should give the correct model and specs to the network .

Originally Posted by saywhatt

similarly, you can also recover your IMEI using this method: http://forum.xda-developers.com/show....php?t=1264021

nice jobe OP!

My P500 LG Optimus is showing as KP500 LG Cookie.

Originally Posted by G@vi

My P500 LG Optimus is showing as KP500 LG Cookie.

lol , which url did you use?, the one post by mikaelel
http://www.imei.info/, seems to giving some wrong info.