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Q: Why is my IMEI showing as invalid?

An IMEI may be invalid due to incorrect entry of digits, missing check digit, or mismatched checksum not divisible by 10. Our IMEI check digit calculator can generate the correct digit and validate the full IMEI number.

Q: Can I calculate the IMEI check digit offline?

Yes, but manual calculation using the Luhn algorithm is time-consuming and error-prone. Our online IMEI calculator tool automates this process with speed and precision.

Q: Is IMEI Info’s calculator secure and private?

Absolutely. No data is stored or shared. The tool is entirely free to use, requires no registration, and protects your privacy while validating the IMEI.

Q: Can this tool verify a second-hand phone’s IMEI?

Yes. If a seller provides only the first 14 digits, you can compute the 15th digit to confirm the full IMEI—even before purchase.

Q: Does this help prevent CEIR or EIR registration errors?

Yes. By validating your IMEI beforehand, you ensure compliance with GSM database requirements, reducing the risk of rejection or blacklisting problems.

Q: What phone models does this cover?

Our tool works universally for all GSM-compatible devices — including Android, iPhone, feature phones, tablets, and IoT devices that have a 15-digit IMEI format.

Q: Is there a limit on how many IMEI numbers I can check?

No. You can use the IMEI Calculator as many times as needed, free of charge, with unlimited usage and no usage tracking.

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What is an IMEI check digit?

The IMEI check digit is the 15th digit of the IMEI number, calculated via the Luhn algorithm to validate the preceding 14 digits and prevent errors or tampering.

Why is my IMEI showing as invalid?

Can I calculate the IMEI check digit offline?

Is IMEI Info’s calculator secure and private?

Can this tool verify a second-hand phone’s IMEI?

Does this help prevent CEIR or EIR registration errors?

What phone models does this cover?

Is there a limit on how many IMEI numbers I can check?

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