(plural cordless phones)
This does not cover mobile phones or radiotelephones (other kinds of wireless telephones) as the RF signal is used to communicate from the base to the handset, and not from the telephone unit to the telephone network.
cordless phone - Computer Definition
A wireless telephone that transmits to and receives signals from a base station within a range of a few hundred feet. The first landline phones not tethered to the desk or wall, cordless phones were invented in the 1950s but did not take hold until the 1980s. Initially analog devices transmitting at very low frequencies, the 900 MHz band was chosen as the standard by 1990. Cordless phones subsequently migrated to digital and higher frequencies from 1.8 to 5.8 GHz (see DECT). Contrast with "corded phone," which is wired to a table-top or wall unit. Also contrast with "mobile phone," in which the base stations are cell towers (see cellphone). See multihandset cordless and cord cutting.