We need to start from the ( SIM ) "Subscriber Identification Module" is a chip that stores:

• International Mobile Subscriber Identity (IMSI)
• ICCID – unique serial number
• Security authentication and ciphering information
• Info that is stored temporarily and stored to your local network
• List of services available for user
• Personal identification number (PIN)
• Personal unblocking code (PUK)

How it works: Your own iPhone sends IMSI number to the current network while registering. IMSI number allows network hardware to recognize the subscriber, to prevent the interception IMSI is sent as rarely as its possible. Sometimes rather than IMSI number, the device sends TMSI (Temporarily generated code for mobile subscriber identity).

NOTE: You should never to confuse IMSI and IMEI (International Mobile Equipment Identity, its 15-digit number which is unique for each device). Your IMEI number is additionally provided for the carrier by signing up in network. Also, IMEI number can be simply used for tracking phones or blocking stolen devices.

But you are  not able to find your IMSI number (or you dont understand what it really is), then just keep reading this post. IMSI number is the original SIM card number, it includes 15 digits which can be split in three groups:

• MCC (Mobile Country Code) – first 3 digits of IMSI code.
• MNC (Mobile Network Code) – fourth and fifth for EMEA countries (Europe, the Middle East and Africa) or fourth, fifth and sixth digits from the code for the other (NAR) countries.
• MSIN (Mobile Station Identification Number) – the last 9 /10 digits from the IMSI code.

IMSI code for EMEA countries:

MCC and MNC digits from 1 to 5 / 6 (colored with red and yellow) present the network. Regional operators could be calculated by last 8 / 9 digits (colored with blue and yellow) also known as MSIN code.

How to locate where is IMSI stored locally:

You should use two tested methods to locate your iPhones IMSI number:

• If you found the IMSI number click here
• Type it into the field called "Enter IMSI number".
• Its going to display your SIM carrier’s country, operator, your MCC and MCC code

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