i have been looking at the no-name carriers using GSM-ATT towers, looked + read on the howard forums + narrowed it to air voice, red pocket + US Mobil the current front runner. i have not seen any that hold data past your periodic refills, that said US Mobil offers you build plans 500 mb of data is $5 monthly the other particulars vary, but way cheeper than any big name providers. i talk little + tex even less but looking for some data as my ATT $8 monthly for 20 min talk allows no acess to data with my older but new to me smart phone. my older flip phone could send poor pics priced per use but with 3G going away i found a nice new 2016 model sony xperia XZ. its a great phone for $150 on E-bay but i thought i could send the great pics it takes but NOT with my current plan. the more you search the more phone carriers will show up, read, learn + select. with these carriers you need to set up the APN in your phone + most show exactly how to do it. i am not computer or phone savy but hopefully i can do that even if i need their help, one thing that was supposed to be better with US Mobil, time will tell! good luck saving a buck, sounds like me you hate throwing money away on not needed overpriced plans !!!