it depends on your area, urban, rural look at maps, but I've had great service from Net10. can pay lessa than $40/month when buying 6 months of service n use coupons at kmart. unlimited has never slowed, service is not everywhere as much as major carriers. had sprint n loved it, 10 yrs ago, switched to Verizon, which was great but got too expensive, then went to AT&T n great as well buy price always goes up it seems. I don't want pay 70-120 single line family plans cheaper of course unless u pay whole bill.
big fan of net10, which is same as straight talk, that's owned by tracphone. less than $40/month, no extras charges n has good phones as well, just look at maps first if live in rural areas.