Related systems which are not mobile phones

Cordless Phone (Portable Phone)
Cordless phones are standard telephones with radio handsets. Unlike mobile phones, cordless phones use private base stations that are not shared between subscribers. The base station is connected to a land-line.
Radio Phone
This is an term which covers radios which could connect into the telephone network. These phones may not be mobile, e.g. they may require a mains power supply.
Professional Mobile Radio
Professional mobile radio systems are very similar to mobile phone systems and attempts have even been made to use TETRA, the international digital PMR standard, to implement public mobile networks, but normally PMR systems are sufficiently separate from the phone network to not really be considered phones but rather radios.