Sprint has a friend referral program that gives you $25. Since I switched from Verizon to Sprint, I was eligible for this program. You can get full info at sprint.com/landings/refrewards/
All you have to do is follow the instructions and enter your friend’s Sprint phone number and you both get a $25 Visa debit card as shown below. It takes a few weeks for them to send out the card. But hey. It’s free money.
Not only is this program now over (as of 1/24), but it turns out they charge you $3 per month “service” charge. What a rip off.