Up until September 1st, customers porting a number to Boost got a $50 instant rebate on any new or CPO Boost phone. That meant that dealers could offer a free Alcatel OneTouch Elevate, Huawei Union, Motorola Moto E, Kyocera Hydro Reach, ZTE Prestige, LG Tribute K3, LG Volt 2, Alcatel OneTouch Conquest or ZTE Warp Sync phone or a $50 CPO iPhone 5c or $100 iPhone 5s to customers switching to Boost.
Effective September 1st, the $50 instant rebate has been replaced by a $50 account credit which is applied to the customer's account after their second monthly payment.
As before, the port-in promotion is only available to customers porting from a non-Sprint based carrier or MVNO. In addition, the customer's number must have been active on the non-Sprint carrier for at least 15 days to be eligible for the promotion. The $50 port-in promotion is only available through Boost dealers, not online or at big box stores.
Sources: Wave7 Research, Boost dealer newsletter