i use to have a zte warp 4 and i was amazed how perfect my first boost mobilee 4lte ran. the phone allowed data and cell to run at the same time. so you can hotspot and still make calls at the same time. the onbly problem i went thur a couplle of them and realized that the lcd connenction to mainboard is a flaw in the design and as with my old phone the new warp 4 was having screen issues and i had to take it apart and recoonect the lcd coonection. aye aye ye.. I believe the warp 4 uses channel 7 ? and lte is always connetcs to a verizon tower so roaming will always be on.. i wish boost haves a new phone that did that..