Add international calling credit to your account in increments of $5, $10, or $20. International calls, or calls placed from within the United States and made to other countries, will automatically deduct from your international calling credit on a pay-per-minute basis.
Adding international calling credit to your account is the same as adding "money to your wallet." The funds in your wallet can either be used to cover the cost of international calls, or to pay for the cost of your plan. If you add credit to your account for a one-time international call and do not use all of your balance, you can easily apply your remaining balance towards paying for your plan.
International calling rates vary by country. See Mint Mobile's full list of supported countries and international calling rates here.
International calling to Mexico and Canada is included for free with all of Mint Mobile's plans.