To put your phone number on a different SIM card, or to activate a new SIM, you'll need the SIM number. It's written on the SIM itself, but you can get it from the settings too. Here's how.
Open the Settings and go to About > Status (might be 'Phone Identity'). In there you'll see some numbers like the 'IMEI' number. Your SIM number will show as either the 'IMSI' number, or the 'ICCID number'.
If you can't see your SIM number in the settings, then you'll need to take the SIM card out of the phone and read it from there. It's written on the plastic side.
Hopefully that's you sorted, but if you need more help, you can get in touch with an expert from Team Knowhow here.
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