T-mobile for years and still is cheaper then ATT & i assume Verizon. I was paying $165 for 4 unlimited lines with mobile hotspot. Now with T-Mobile same level of svc is $130 a month. Its up in the air tho if the service is a reliable and good as AT&T as i do have issues with T-mobile .. echoes heard on calls, calls not going thru/just dropping instead of connecting and no service at all where i previously had it with ATT (in southern york county pa by MD line).