LTE:

https://en.wikipedia.org/wiki/LTE_(telecommunication)

https://www.digitaltrends.com/mobile/4g-vs-lte/

https://www.signalbooster.com/blogs/...een-4g-and-lte


4G will be around for many years. It takes a lot more 5G cell sites to cover the same area, and it will be many years, if ever, before all areas have 5G.


They don't photograph a black hole, they photograph the light outside the event horizon being emitted by the stuff falling into the black hole.