I seen advertisment today that t moblie had they call it stash data. If you don't use the data why lose it or the big companies keep it. You pay for it. So they rollover to the next month. That idea to pass on to the big boys in charge.
I know tracphone has data rollover. But you have to buy new data card every 3 months. I now have around a 1000 unused data. Sure will be gald if ever get cell tower done and hope it takes TracPhone. Theyare suppose to have ATT&T,Verizon and something else that works.