More expensive, high-frequency "millimetre wave" (mmWave) services provide faster speeds but are more controversial
A fight over access to radio-wave frequencies for 5G mobile data is coming to a head as officials decide how wavelengths should be allocated.
The European Space Agency has warned opening up the airwaves will harm climate change research and make weather forecasting more difficult.
But a mobile industry group says these claims are "unfounded" and will limit networks' ability to offer fast speeds.
Ministers and regulators are meeting in Egypt to discuss the options.
