One way to convince yourself that a fridge is simpler than a 5G cell system is to look at the science history behind them. The heap pump, the core concept behind a fridge, goes back to 1748 (Cullen). Radio goes back to Maxwell (circa. 1864) and Hertz (1886). Basically at the time that Radio was invented/discovered refrigeration along the lines of the modern fridge was well understood. The first cellphone was invented in 1973 and the first commercial cell phone was 1983. Lots of technologies in the latest generations that are pretty cutting edge and today's phone and technologies look like science fiction to someone from the 1970's or even 1980's...