why subs ultrasonic not infrasonic? (or normal sonic)

[Shannon]

How long ago did serious get-down-to-business 6G development start? Just curious how long you've come in what amount of time

I have been developing the next generation from the moment I solidified the "what is the previous generation?" for each generation. So I guess it's been what, 2 or 3 years now? Something like that? I just did not call it 6G back then because I am never sure if it can be improved on.

The difference between what can be achieved in 5G and 6G is tremendous, but so is the difference in complexity and how long each step of development requires.