But there's a catch: You have to commit to a new smartphone as part of the new upgrade program. Also, only a select number of flagship phones are available for an upgrade.
The Uncarrier has the most to win or lose in next year's spectrum auction, including whether it has a chance to be a true competitor to Verizon Wireless and AT&T.
The 5.7-inch smartphone, now available through Boost Mobile, will come to Sprint in June.
Its pitch to consumers pays off with a gain of 1.2 million customers to hold T-Mobile at bay. Still, Sprint's aggressive promotions have also brought mounting losses.
The carrier's new "Never Settle" promotion will give Verizon customers a free phone to play with for 14 days and then pay Verizon's early termination fee for customers who switch over permanently.
The Uncarrier march continues to pick up steam, but the growth is coming at a cost as the wireless carrier posts another loss because of its aggressive promotions.
Electronics retailer Dick Smith has launched post-paid mobile plans via Think Mobile.
Thanks to its "no device subsidy" model, AT&T says it lost fewer customers to rivals than it ever has in the first three months of the year.
The largest US carrier remained vulnerable to competitors' pitches in the first quarter of 2015, but it did manage to slow the number of customers jumping ship.
Letting you roll over the data you don't use by the end of the month, the carrier's Data Stash program will be available to Simple Choice prepaid customers.