Seonglae ChoWifi Versions
Same frequency range can cause collision which are treated by increasing strength of signal
Mobile telephony also use above free frequencies. Government lend spectrum for decades to cellular network providers. They want to reduce licensed spectrum usage because it is not free unlike using through their wifi installation in everywhere. That means mobile providers are not kind by providing Wifi access.
All these use CSMA/CA for multiple access protocol, and have base-station and ad-hoc network versions