Final answer:
To add minutes to a Pay as you go phone, customers can use refill cards purchased from stores or online options provided by the service carrier.
Step-by-step explanation:
To add minutes to a Pay as you go customer's device, the correct answer is D) Use refill cards or online options to add minutes. Refill cards can be purchased at various retail locations and then the code on the card is entered into the customer's device to add the specified amount of minutes. Additionally, customers have the option to add minutes through the carrier's online portal, where they can select the amount of minutes they wish to purchase and pay for the service instantly using a debit or credit card.
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