One data point:

* Base amount: $180

* "Recovery fee" (which they describe in [0]): $18.5

* "Taxes and Surcharges": $3.89

[0]: https://www.mintmobile.com/taxes-and-fees-explained

Good point. Some of it was taxes, but I forget how much, and they don't tell you in your email receipt. I might be able to dig up the exact breakdown.

   Renew 10GB 5G • 4G LTE Data Plan for 6 Months
   Summary
   10GB 5G 4G LTE Data 6 Months
   $150.00
  
   Recovery Fee
   $11.50
  
   Taxes & Surcharges
   $2.05

So if we treat the "Taxes and Surcharges" as just normal American customs, 18 months of this would be about $35 in "recovery fees".