This Friday will be a very busy day for Sprint's prepaid brands, Boost Mobile and Virgin Mobile. The former will see no less than three new smartphones launching on April 15, while the latter will have to go with two out of three. The trio in question consists of the Samsung Galaxy J7, LG Stylo 2, and Kyocera Hydro Reach.The Galaxy J7 arriving at Boost and Virgin isn't this year's iteration,
