4 lines with unlimited data starts at $120/month at Tmobile (and goes up to $160 or $200/month if you want to add tethering and international data). If they hav

4 lines with unlimited data starts at $120/month at Tmobile (and goes up to $160 or $200/month if you want to add tethering and international data). If they have decent coverage where you live, you should switch.