So with the order of the $20 deal for 3 mo w/5gb LTE, Mint included a trial kit with 2 SIMs. Looks like a good way to get a week's worth of cell service. The first SIM allows you to activate and use in your usual places to ensure coverage, the 2nd SIM meant for you to port in your number. Very nice!
"The trial kit includes 100MB of 4G LTE data, 100 text messages, 100 minutes of talk and two SIM cards."