Add to the Wallet of Mint Mobile triggers the credit - Mint Mobile is the same type of operator as Google Fi, being a "Mobile Virtual Network Operator" using T-Mobile network, does not fit the T&Cs, yet the $10 and $5 adds done on same day trigger the $15 credit. (Mint only has $5, $10 and $20 to choose from).

In Feb the $10 and $5 were not done on same day but the $15 credit posted after 2nd add to bring the total to $15+ (there is $0.50 surcharge on each load).

In Mar I added $10 and $5 on same day. $15 credit posted the same day the charges posted.

Will do the same in April and the following months.