That's done to avoid interference and happens as minimally as possible which makes for easier signal processing. Military communications actively switch frequen

That's done to avoid interference and happens as minimally as possible which makes for easier signal processing. Military communications actively switch frequencies many times per second in unison according to highly secure crypto-variables. This makes jamming and eavesdropping very difficult because its hard to tell active channels from brief background static. Bluetooth, on the other hand, has about 80 channels about 1mhz apart and it tries to bond as many as possible for parallel transfers. This is why when you are far away from a bluetooth device the transfer speeds degrade rapidly.