Sprint has introduced a special $100 discount for people buying phones and porting their number over from a rival network. The deal will also apply
to Apple's new iPhones, coming September 20th. A 16GB iPhone 5c will be free on contract, and a 16GB 5s just $99. The iPhone 4S will also be an option, but free, like the technically superior 5c.
Also launching on the 20th is Sprint's One Up upgrade program
, which gives the option of paying for the unsubsidized cost of a new phone on a monthly basis, much like T-Mobile. The $100 discount, though, is a limited deal, set to expire October 10th.