The 15th digit or the last number of the IMEI is called the "check digit" and its calculated using the Luhn algorithm

The check digit is validated in three steps:

1. Starting from the right, double every other digit

2. Sum the digits (e.g., 39 → 3+9).

3. Check if the sum is divisible by 10

For example:
Validate with right check digit IMEI 35780502398494?

STEP 1: DOUBLE EVERY OTHER DIGIT FROM THE RIGHT
IMEI 3 5 7 8 0 5 0 2 3 9 8 4 9 4
Double every
other digit 3 10 7 16 0 10 0 4 3 18 8 8 9 8

STEP 2: SUM ALL 3+(1+0)+7+(1+6)+0+(1+0)+0+4+3+(1+8 )+8+8+9+8 = 68

STEP 3: CHECK SUM, IF ITS DIVISIBLE BY 10
68+?
Hence the check sum is "2"
The complete imei becomes 35780502398494 2

clap for yourself boi... thread makinq sense since stone age...

3RNEST: clap for yourself boi... thread makinq sense since stone age...

You still dey that ebola region?

femi4: You still dey that ebola region?

yes na, where u wan make i go?

Femi4, can you please help me unlock my MTN fastlink E303 modem? Thanks
IMEI: 867648010400339
S/N: U9CBYA9270918923

femi4:
The 15th digit or the last number of the IMEI is called the "check digit" and its calculated using the Luhn algorithm

The check digit is validated in three steps:

1. Starting from the right, double every other digit

2. Sum the digits (e.g., 39 → 3+9).

3. Check if the sum is divisible by 10

For example:
Validate with right check digit IMEI 35780502398494?

STEP 1: DOUBLE EVERY OTHER DIGIT FROM THE RIGHT
IMEI 3 5 7 8 0 5 0 2 3 9 8 4 9 4
Double every
other digit 3 10 7 16 0 10 0 4 3 18 8 8 9 8

STEP 2: SUM ALL 3+(1+0)+7+(1+6)+0+(1+0)+0+4+3+(1+8 )+8+8+9+8 = 68

STEP 3: CHECK SUM, IF ITS DIVISIBLE BY 10
68+?
Hence the check sum is "2"
The complete imei becomes 35780502398494 2

Femi, pls can u help me unlock dis mtn modem?

Make: Huawei.
Model: 303s-1
IMEI: 861662007912109.
S/N: U9CBYA9261637495.

Tanx a lot.

[quote author=femi4 post=26125251]The 15th digit or the last number of the IMEI is called the "check digit" and its calculated using the Luhn algorithm

The check digit is validated in three steps:

1. Starting from the right, double every other digit

2. Sum the digits (e.g., 39 → 3+9).

3. Check if the sum is divisible by 10

For example:
Validate with right check digit IMEI 35780502398494?

STEP 1: DOUBLE EVERY OTHER DIGIT FROM THE RIGHT
IMEI 3 5 7 8 0 5 ...femi i don't understand the last step can you pls expansiate

[quote author=luke007 post=28649997][/quote]When you add all the digits together, your result must be divisible by 10.

So, if your summation is 58, the immediate number divisible by ten is 60. Hence, the check digit of the imei is (60-58) = 2

thanks femi now i understand

Nawao

asnasis:
Or easier way is using IMEI calculator tool

Sure, but you will appreciate it better if you know how the calculator was programmed

Hi Femi,

I want to know...a friend got an iPhone from someone. And it's locked. She said something like iCloud lock...can it be unlocked??

Thank you.