What is a sims number and what is it for

I wana know what a SIM card or number is? What is it used for , I see the setting for Sims Number can someone tell me what it's for and how it will be useful tome Thanks

The ICCID is the SIM Card number, it is the unique number of the SIM Card. If you have a new SIM Card, this is the number you give to or say to the Carrier to have the SIM Card activated so you can use the cell service of your iPhone with this new SIM Card. At that moment your phone number will be linked to this SIM Card for telephone purposes. Otherwise the number is not important. Also once the number on the SIM Card is activated by a Carrier, it can never be activted again. So once deactivated you cannot use that SIM Card for cell service again.

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