It doesn’t really make a lot of sense. The amount of lithium batteries ready for recycling vs the demand for lithium is likely low single digit percentages and almost certainly will stay that way for the foreseeable future.

It’s fundamentally impossible they’ll be the #1 carried carrier globally. That’s due to physics. A wireless communication medium cannot be even competitive in comparison to a fibre optic communication medium so in high population density areas that fibre makes sense they’ll have low customer counts.
In rural areas though they could absolutely become the #1 ISP.

It an openai.com website. It’ll be probably your first link in google.

5G (in cellular communications) definitely doesn’t stand for “5 gigahertz” it stands for “5th generation”. I’m pretty sure 5G doesn’t even use any frequency in the 5 gigahertz range globally.

Source re the frequency usage: https://en.m.wikipedia.org/wiki/5G_NR_frequency_bands

Aren’t most airlines globally now allowing Bluetooth and WiFi inflight? They are in Australia.
I think the historic reasons for technology off inflight was a near entirely unfounded fear of interference.
The reasons for putting certain devices away during takeoff and landing is the risk of flying objects.
The reason airplane mode is still mandated on flights to my understanding is because of the likelihood that people will start taking calls and being even more annoying during flights.