Best answer: Yep, you can upgrade your existing Mint Mobile account to the Unlimited plan (or any other higher-data plan) by paying the difference in price. All you need to do is log into your account and follow the prompts. You can also set your subscription so the upgrade occurs when your current plan ends.
How to change your Mint Mobile plan
Whether you keep running out of data mid-cycle or you want the benefits of the 10GB mobile hotspot, Mint Mobile makes it easy to upgrade to a higher-tier plan whenever you want, as long as you’re cool with paying the difference in cost. Simply log into your account on the Mint Mobile website or app, select Manage Plan, and follow the prompts so the change goes into effect immediately. You’ll then be directed to a Checkout page that’ll let you pay for the difference between your old plan and the upgraded plan.
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