causes of clicking in phone connection
People who still connect to the Internet using a dial-up connection also may feel the effects of phone line noise, which can interfere with their online surfing. Some modems are so sensitive that even the tiny beep caused by call waiting can terminate an Internet session.
1 Electrical interference: Power lines, radio or television transmitters, transformers and other electronic devices may cause noise on the phone line. 2  Other phone devices: Fax or answering machines, other phones and line splitters -- devices that allow two phones to fit on one phone jack -- can cause phone line noise.