Blog Archives - Free IMEI Info

Check digit computation

The last number of the IMEI is a check digit, calculated using the Luhn algorithm, as defined in the IMEI Allocation and Approval Guidelines:

The Check Digit shall be calculated according to Luhn formula (ISO/IEC 7812). (See GSM 02.16 / 3GPP 22.016). The Check Digit is a function of all other digits in the IMEI. The Software Version Number (SVN) of a mobile is not included in the calculation.

The purpose of the Check Digit is to help guard against the possibility of incorrect entries to the CEIR and EIR equipment.

The presentation of the Check Digit both electronically and in printed form on the label and packaging is very important. Logistics (using bar-code reader) and EIR/CEIR administration cannot use the Check Digit unless it is printed outside of the packaging, and on the ME IMEI/Type Accreditation label.

The check digit is not transmitted over the radio interface, nor is it stored in the EIR database at any point. Therefore, all references to the last three or six digits of an IMEI refer to the actual IMEI number, to which the check digit does not belong.

The check digit is validated in three steps:

  1. Starting from the right, double every other digit (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 49015420323751?,

IMEI 4 9 0 1 5 4 2 0 3 2 3 7 5 1 x
Double every other 4 18 0 2 5 8 2 0 3 4 3 14 5 2 x
Sum digits 4 + (1 + 8) + 0 + 2 + 5 + 8 + 2 + 0 + 3 + 4 + 3 + (1 + 4) + 5 + 2 + x = 52 + x

To make the sum divisible by 10, we set x = 8, so the complete IMEI become 490154203237518

What can I check by imei number?

By using this unique IMEI Number you may get to know such data as: the network and country from which your device originally comes from, warranty information date of purchase, carrier information, system version, device specification and more details information. When it is recommended to check the IMEI Information? You should use IMEI checker before buying used or new device. As a result you will see if the device is valid and original. What’s more, you can also check if the specification is consistent with the selling offer. We also encourage to use the IMEI Information just to know your phone better and read important information about the device. The IMEI.info offers also some advanced services (it is available for some manufacturers) for example: Find My iPhone Status, iCloud Status, Blacklist Status, Seller Information, Network & Simlock checks, Phone Blacklist, Carrier Check, Warranty Checks, Unlocking Simlock. Let’s check IMEI and make sure that your phone is unlocked.

 

What is an IMEI number?

Source: IMEI check –  IMEI checker online | FreeIMEI.info

IMEI is a 15 digits number, which can be displayed on the phone LCD by dialing *#06# just as a phone number.

Source: IMEI check –  IMEI checker online | FreeIMEI.Info

Please enter only numbers, without spaces or signs like “-” or “/”. Quite often the IMEI number can be longer, but we only need the first 15 digits. If you own an Apple product like iPhone or iPad, you can find the IMEI number in the phone settings. Android devices also have an IMEI number in the phone settings. Other devices like modems, which doesn’t have a screen, need to check the sticker on the device to find the IMEI number. IMEI24.com – free IMEI checker will recognize your phone model and will check your phone warranty information

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