: Most convenience stores and big-box retailers sell physical "Refill Cards." You enter the PIN from the card into your iPhone's phone dialer or the carrier's website to activate the minutes.
: If you need to call someone in another country, you can "buy" an international calling add-on through your carrier's account settings. can you buy minutes for an iphone
If you use a prepaid carrier (like Tracfone, Mint Mobile, or AT&T Prepaid), you buy minutes by "topping up" or adding a "refill" to your account. : Most convenience stores and big-box retailers sell