PSTN
Public Switched Telephone Network
PSU
Power Supply Unit
PTO
Public Telecommunication Operator
PTT
Posts, Telephone and Telegraph Administration
PTT
Push-to-Talk; a feature of PMR systems
PWT
Personal Wireless Telecommunications; a variant of DECT developed for use in the USA
PCN
Personal Communications Networks; an outdated term for GSM services in the 1800MHz band
PDA
Personal Digital Assistant; a sophisticated handheld device with advanced display facilities and a range of business-oriented software programs
Phone book
A list of personal names and numbers stored in a mobile phone’s internal memory or in the SIM card. These numbers can be called by accessing the appropriate memory and making a single key stroke
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