However, it is not (yet) available for iPhones.
The promotion promises 2,500 miles once you add your Chase United MileagePlus Explorer card to the Softcard app and make one payment.
For each single payment in a consecutive month, you will get another 500 miles.
Softcard also has a number of coupons for extra savings that can be stacked with any other credit card coupons.
Participating retail locations can be searched with the app or with the website tool.
Business United Explorer cards may not be able to register for the promotion.
Now all I need is an Android phone…