Sprint is offering up-to $125 service credit when you port your number from another carrier and activate a new phone with a 2-year contract. To get this deal, register here within 72 hours of porting your number. Porting and activating a new feature phone on Sprint scores you a $50 service credit and porting and activating a smartphone gets you a $125 service credit. The credit will then appear on your invoice after approximately 60 days. Deal expires July 23, 2011.