Why does a cell tower need to be massive to transmit data to a smartphone but the phone’s extremely small antenna can transmit data back over the same distance?

Question

Why does a cell tower need to be massive to transmit data to a smartphone but the phone’s extremely small antenna can transmit data back over the same distance?

In: 52

Answer 1

Massive cell tower can detect small signal and output big signal.

Extremely small cell phone can detect big signal and output small signal.