Because phones require a number of different technologies and pieces of equipment to transmit audio information quickly, there is a wide array of different things that can be responsible for phone line static and noise distortion. These problems can stem from things as simple as defects in the wiring and equipment in the home, or can be caused by other extraneous factors like the weather.
Faulty wiring is one of the most common reasons for phone static and noise problems. When the wire in the home has become deteriorated or was not managed properly when installed, it can result in disruptions to the phone's audio quality. However, other types of interference can disrupt the audio of a phone call as well. Electrical interference from objects like power lines, radios, televisions or transformers can also cause different types of noises. The weather can cause static in two ways. Rain can seep into phone lines, which deteriorates the wiring and causes static. In addition, high-energy bursts of lightning can also do damage to the network that connects the audio information.
Certain other types of phone devices can disrupt the signals and lines of the original phone network. These types of devices include answering machines, fax machines and other phones. If these are running in the background, static and noise disturbances may be experienced.