You might need your SIM card number if you're moving your phone number, or if you need to activate a new SIM card. The SIM number is written on the SIM card itself, but you can get it from the Settings too. Here's how.
From the Home screen:
Go to Settings > General > About.
The 'ICCID' (Integrated Circuit Card ID) is your SIM card number.
If there's a problem with your SIM card, or for some reason you can't find it in the settings, you might need to take the SIM card out and check the back of it for the number.
Hopefully that's you sorted, but if you need more help, you can get in touch with a Team Knowhow Expert here.
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