I also had the Sprint BYOD promo for a year since I had an unlocked iPhone 6+ at the time. The network was only very slightly worse than Verizon (mostly in and

I also had the Sprint BYOD promo for a year since I had an unlocked iPhone 6+ at the time. The network was only very slightly worse than Verizon (mostly in and around NYC). I switched to Tello (Sprint MVNO, $17/mo for 3GB) when the promotion ended and the network quality has been the same. I only chose Tello because I already had the SIM and my plan was going to renew within 48. It's been fine. I probably would've bought a new phone sooner but the terms were ambiguous as to whether or not switching phones (even one purchased separately and fully paid) would negate the promo or not.