What does the numbers on the back side of SIM card mean?

It is ICC-ID (Integrated Circuit Card - ID). Up to 22 digits can make up this Integrated Circuit Card Identifier (ICC-ID). It consist of several parts which is used to identify the SIM globally.
The first two digit of number represent industry code, which is 89 common for telecom industry.
The next two digit represent country code.
  • Like 91 is country code for India, 49 for Germany, 1 is for USA.
The next two/three digit is Issuer Identification Number.
  • 25 is used as Aircel (IIN).
The next four digit is year and month of manufacturing.
The next two digits refers to the switch configuration code.
The next six/seven digits refers to the SIM number.
The last digit which is separated from the rest is called the checksum digit.

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