The foneAlone is a device that will automatically disconnect your answering machine, FAX, or computer modem from the phone line any time that another phone on the same line is taken off hook. It can also be used as an automatic exclusion device. If there are several extension phones on the same line, a foneAlone can be placed on each extension so that the first phone answered will have the line. The other phones will go dead. This will prevent eavesdropping or accidentally interrupting a call. FAX or Computer data can be protected by this device from someone accidently picking up an extension while the line is in use.