Tell us about yourself!
I agree that may be true for larger ISP's should you happen to live in major city and use it there exclusively. Coverage however, would be limited to the range of the ISP's hotspots. Considering you now have a bill from your cell provider and one from your 4g ISP, which will likely equal more than the cost of upgrading your cell service, its appeal begins to decline.I'm not knocking your ingenuity or creativeness. Its a clever application and would definitely garner some respect from all my nerd friends. I just don't see it as a practical solution for the average person to save money on their phone bill.