Verizon, Spectrum, and AT&T cost too much to consider financially. T-Mobile is more expensive than Boost and Cricket for less than 8 lines, but is never the cheapest. If you need less than 5 lines, then Boost is the cheapest. If you need exactly 5 lines, then both Boost and Cricket charge $175. If you need more than 5 lines, then Cricket is the cheapest.