What is a SIM serial number and why do you guys need it?
What is a SIM serial number, where do I find it, and why do I need it?
Your SIM serial number is a long number that uniquely identifies your SIM card (and is linked to a specific mobile number and account). It's the long number that is printed on the back of your SIM card. We need your SIM serial number in order to get your mobile number moved from your old provider over to Skinny.