This offer ($90-$45), combined with Mint Mobile’s various features, makes it possible to keep a Mint Mobile phone plan at a low cost. The maximum recharge amount is $360, enough to cover at least two years of a $180 plan. If you have multiple Mint AMEX Offers, this phone plan is still highly recommended. Even if you leave the US, it supports Wi-Fi Calling for making calls and sending texts. For details, see: