Thumb Score: 0
Mint Mobile [mintmobile.com] has for New Customers: Buy 3 Months Get 3 Months Free: Plans from $ 15 per/mo.
From Terms and Conditions: "3 months of promotional credits will be applied after eligibility verification and account activation, and will be no less than the value of the initial plan purchased. Final promotional credit value subject to change and may be applied directly to renewal/upgraded plan
Please see terms and conditions for details [mintmobile.com]