An external caller ID device connects to your landline telephone connection and informs you visually of the number that is currently calling you. The devices include a LCD display and which also shows the caller’s name, date and time of the incoming call. An external caller ID requires you to have a subscription through your area telephone service provider for caller identification service before the device can work. External caller ID devices are also available that can display an incoming call’s number when you are using the phone. This devices are known as “Caller ID-Type II” and “Enhanced CallerID.” This feature works with the call waiting feature and also requires that you subscribe to the call waiting service before the device can process the caller information. Writer Bio
