[Guide] Why my IMEI missing & NO network?
Your IMEI (International Mobile Equipment Identity) is transmitted to the Network provider the moment you switch ON
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
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 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
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