Softcard (formerly ISIS) is offering 4,000 free United miles for linking your Chase United MileagePlus card with the Softcard app. Earn 2,500 miles for syncing your card with the Softcard app. Earn an additional 500 miles each month for using your Chase card to make a purchase to earn a maximum of 4,000 miles total.
Softcard is available on select phone on AT&T, Verizon, and Verizon. You can check your availability at this page.
Offer expires February 28, 2015.