Sprint offers a $50 service credit
when you port your number from another carrier and activate a new phone with a 2-year contract. That's the best credit offer we've seen from Sprint. Note that after porting your number, you must register here
within 72 hours. The credit will then appear on your invoice after approximately 60 days. That ties our February mention as the best such offer we've seen from Sprint. Deal ends July 23.
Sprint also offers a $125 service credit for free when you purchase a smartphone with a new line of service, in addition to porting a separate number from another carrier. A 2-year data contract is required.