A:AnswerIt will come with three different SIM cards, you can reduce the size of each card (larger to smaller). Eject your SIM tray and match the size, it is quite simple. I don't think it matters which SIM card you use but make sure you keep the others as spares to be used on other phones you may get/have.
A:AnswerYes one of the 3 included Sims will work. Typically go to the BYOD section of Boost's site and enter your imei and it will tell you the compatible sim.
A:Answerno, this kit has 3 sim cards SIMOLW416Q + SIMOLW506C + SIMOLW506TQ whereas LG G5 uses SIMGLW446C sim card. If it's a sprint mobile, better buy a sim card from sprint store (they might toss it for free) or sprint online.
A:AnswerHi yes it will work on boost mobile you have to call them for it to work you can't do it your self is best if you call customer care you will be happy