Backbone doesn't batter i.e. it can be VSAT Internet like SpaceX, Fiber optics or  Lasers(FSOC); the problem I'm stating is with edge i.e. using your phone wifi for Internet anywhere in the open world and not being dependent upon 4G/LTE/5G.

There are already providers doing that, In India WiFi Dabba has been launched recently which addresses the problem discussed here in the city of Bangalore; I have analysed it here - https://www.quora.com/What-is-your-view-on-the-Bengaluru-startup-WiFi-Dabba/answer/Abishek-Muthian.