Hello, David.
Once you have your SIM, you can activate by putting it into the phone and turning the phone on. The SIM will automatically activate after that, and a text will be sent to the SIM confirming the phone number that belongs to the SIM. Once you view the top up options for the account, you'll see that some of the packs on offer are the auto renew packs. Once you select one of those, you'll be given the option on how the auto renew should be billed each month, and then once you complete the purchase, future top ups will be completed using the chosen option.
Pete.
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