EE customers will be able to receive 5G "anywhere" in the UK by 2028, the phone network has announced, with half the population covered in two years' time.
It will also add 4,500 square miles of new rural 4G coverage by 2025.
In some remote locations, coverage will be "on demand" delivered by portable cells, drones and satellites.
Analyst Matthew Howett told the BBC that affordability might be the issue for the most remote areas.
The expansion of 3G services will come to an end, with customers across EE, BT Mobile and Plusnet being "phased off" in the next two years.
The company said its 5G network, would "grow to cover half of the UK population by early 2023, four years ahead of the UK Government's ambition".
On demand
EE claims it will cover the "entire UK" by 2028, but while 90% of the UK landmass will be covered by the permanent network, the remainder will be covered by what the company calls "on-demand" solutions.
A company spokesman said the aim was to make getting a connection as simple as ordering a cab.
This might include "portable cells" - a device which could fit in a backpack, connect to a low earth orbit satellite and provide 5G connections across a small area.
For example, a scout leader taking a troupe to a remote spot might use one so that all the group could stay in touch via their mobile phones, the spokesperson suggested.
BT, which owns EE, has previously struck a rural broadband deal with OneWeb, a low earth orbit satellite network, part-owned by the UK taxpayer.
EE also suggested drones might be used to provide "on-demand" coverage.
