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If you use an iPhone with an esim with your prepaid line its possible that when you refill youre just refilling that electronic SIM card versus someone buying a physical SIM card or reloading a physical SIM card. It could also mean you used a method of electronic payment.
I'm not saying you yourself did this I'm just using generalized terms.
This is definitely gonna be related to the eSIM service for iPhone. Did you have any additional questions about this or need help setting it up?