# Check digit calculation

15th or the last number of the IMEI is a check digit calculated using the Luhn algorithm.

The Check Digit is calculated according to Luhn formula. The Check Digit is calculated of all other digits in the IMEI. The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment.

The check digit is validated in three steps:

1. Starting from the right, double a digit every two digits (e.g., 7 → 14).
2. Sum the digits (e.g., 14 → 1 + 4).
3. Check if the sum is divisible by 10.

Conversely, one can calculate the IMEI by choosing the check digit that would give a sum divisible by 10. For the example IMEI 35 780502 398494 ?

 IMEI number Double every other digit Sum all digits 3 5 7 8 0 5 0 2 3 9 8 4 9 4 ? 3 10 7 16 0 10 0 4 3 18 8 8 9 8 ? 3 + (1 + 0) + 7 + (1+6) + 0 + (1+0)+ 0 + 4 + 3 + (1+8) + 8 + 8 + 9 + 8 + ? = 68 + ?

Sum of all digits is 68. We need to make it divisible by 10. We need to add 2 to our Sum of 68 and this addition is our check digit. Our complete IMEI is 35 780502 398494 2.

1. robin says:

Why center numbers in IMEI starts with “0″? Example; 00, 01, 02, 03, 04,
Are they stand for something?

Hello Robin,

if you meant start numbers then it is reporting body information which give information about the issuer.
If you meant for numbers at the end of TAC record (in the middle of IMEI) then it has no special meaning nowadays but is part of TAC number.

Regards

358639048632965
358639048632973

what country 04 mean?

i think india its ok.

We are not aware of this country code.

2. JAMILA says:

Could u pls tell me the last digit/check digit of my imei no and is it valid. i will provide the 14 digits for you 356882020050606 as my maths is rubbish.
bw jamila

15th digit/checkdigit 6 is correct

3. Ali says:

hello!
is there anyway i can know in which country my phone was made? its written ‘made in india’ and its confirm digit is 3, and 7&8 digits are 04.
Regards!

Maybe we can find manufacturer name and then you can investigate in which country this manufacturer exists.

What is your IMEI or TAC?

4. MAyra says:

hey i cant do it it give me a decimal
here is mine.. can u help me
99000060138627

990000601386271

• MAyra says:

thank u

5. Raj says:

What will be the last digit of imei number
3517 640406 6151

351764040661510

6. Confused? says:

Hi,

I calculated my IMEI using the formulae provided. My check digit according to the calculation was 30. However the actual last digit of my IMEI is 6.

I am sure I did my calculations correctly.

I don’t have the box for my iPhone. It was second hand. (NOT STOLEN).

What does this mean for my phone and privacy?

Thanks,
Confused.

We noticed some of the phones with wrong check digit but regular. There could be also fake phones. If you are sure that your phone is regular and original, no worry.

7. Narendra says:

My IMEI number is 359023030880156. I wants to check my modal number and manufacturer

It should be LEMON 320

8. N shravan reddy says:

Hi, when i synced my iphone with my laptop itunes, it is showing the IMEI as 012262007960810 (15 digit), i lost my iphone and i went to my operator (AIRTEL) and it is showing my IMEI as 0122620079608106. after loosing my i raised police complaint and then one person was using the same IMEI number .i.e 0122620079608106. can u pls confirm whether that phone is mine or not by checking the mentioned information at the earliest possible.

N shravan reddy.

012262007960810 seems correct. It should be unique IMEI. We can’t say anything more as we are not authorized to say anything regarding your case.

9. viju says:

sir i have a nokia phone having imei 355391045631896 when sum its digit arrives 70 please inform that the mobile was valid or its my error

Not all devices have legal check digit. Especially it happens with DUAL SIM phones which have 2 SIM cards and 2 IMEI numbers.

10. masud says:

hi there
i heard from some source that the 7th and 8th digit indicates the manufacturing country. “00″ means made in main factory, “03″ means made in Korea … and so on.
is it true or not ? if not then -
1. how so many people talk about it … i mean how they know about manufacturing country ?
2. what this 7 and 8 digit actually means ?
3. how can we find the manufacturing country of a specific mobile set ? (with the help of IMEI no., company website, third party website or nay other means)
waiting 4 ur response …

There is no formula or logic known to us to get the country from IMEI. Also 7th and 8th digit do not tell you much as far as we know.

11. firoz554 says:

I bought my phone from a local mobiles shop, can i register its imei?

Not sure what you mean with register IMEI for bought phone?

12. shuvo says:

353720050331103 this is my imei number
o5 fac code means which country made in??

We are not sure that FAC is country identifier with new phones.

13. BD says:

Hi,
My IMEI no is 359585048846288. can you tell me is it a fake or original phone?

There is nobody who can guarantee this. If phone is fake, it can have the same IMEI as original.

14. Imtiaj says:

I think the IMEI 04 or 40 is Korea… as I have a Nokia E66 and its sticker is written Made in Korea and IMEI is 04.
I m using this over 3 years and still is so perfect condition.

Not sure if this is working out, but think it is not.

15. TT says:

My Imei no. Used to have an 01 at the very end. After a while it has changed to 02.

Im still using the same phone.

If you have a box of your mobile, IMEI should be written there. Also if you have dual SIM phone it should have 2 IMEI numbers.

16. Ayo says:

Pls my imei has 16 digits…am using a nokia phone…is it correct? 3593600378755973

16 digits usually mean that it is 14 digits + SW. This is nothing wrong, but if you want to know what is your 15th digit, you should calculate your check-digit. This is done from first 14 digits. IMEI number 359360037875593 is OK. You can check this here http://imei-number.com/imei-validation-check/.

17. Thomas says:

Could you check my calulations on A000002C2A1928 I come up with 6 , I have a unlock code pending but IMIE does not work.

This is not IMEI but MEID. It is not the same.

18. Lexi says:

My phone was stolen and I called my carrier to get the IMEI for the police report.

They gave me this 18-digit #: 268435461012181021.
When I took off the last 3 digits (to make it 15 digits) and applied the algorithm, it didn’t check; but it checked when I used all 18. Is this normal?

This is strange but, which phone do you have?

19. gowtham says:

hi
i have purchased my galaxy note 2.
please tell me the manufacutre country.and tell me is this original or not?
354666056255672

There is nobody who could guarantee such details over internet.

20. Ravi says:

Hi,
Can any one help me to find my iphone service provider with IMEI number?
IMEI is 00 107200 293161 4

21. Pratheesh says:

How is the quality of 7&8 digit of imei is 50?

I am sorry but we are not aware of the quality by the 7th and 8th digit. If there is any guidance for this we would be greatful if you provide the link.

22. lisa says:

is IMEI AND MEID the same. can u provide me with the last digit of my imei digits.
99000207241717

IMEI and MEID are different, but they are used with the same purpose… like serial number.

23. dyky says:

hello evry one
can eny one help mi ?
i can count the ime no. that is not problem but i don’t know what to do now whit it to unlock mi i phon 4s…
can you help mi or get mi on right web please ?

You need to find unlocking service and provide them your IMEI together with payment. They will give you further instructions.

24. Lydia says:

what if you have a number like this A000002812B710 how do you figure that one out.

Seems MEID and not IMEI.

25. yunus says:

my mobile is stolen and its imei no 13 digits. can you help me please tell me my last 2 digits.
i’m very thankfull to you.

Seems that it is not IMEI, but we cannot help you anyway.

26. fynaz says:

why my imei code all zero

Usually because it is somehow damaged or corrupted.

27. puja says:

Could u pls tell me the last digit/check digit of my imei no and is it valid. i will provide the 14 digits for you 35962304074444

28. amvn says:

Hi! so I tried it and my IMEI number is 99000257277943 and the last one would be 5?… I want to know if i did it right.
Thank you.

29. ellie says:

Good day I have a samgung galaxy note 2 schr950 from US Cellular. It only has a 14 digit imei. 99000207767949. Can this be unlock? If so what will be the last digit?