Refer a friend, get $25. It’s that simple. Sprint’s new Referral Reward program has gotten sweeter by giving you a $25 American Express Reward card for referring your friends to Sprint. Go to sprint.com/refer to sign up and invite your friends and family. Add a link to your social network or blog, send an email or go old school and refer to them face to face. Once they switch to Sprint, you both will receive a $25 American Express Reward card. And at $25 per friend, you can refer up to 20 friends – meaning up to $500 annually in rewards just for you.