Do You Have Other Noises on Your Phone Line?

Is it a hum, whine or buzz?: A mains powered appliance such as a light dimmer, fluorescent lamp or electric motor may be to blame.
Is it harsh static, distorted speech or radio programme?: Radio interference from a broadcast transmitter, amateur radio, CB radio, cell phone, unsuppressed electric motor or welding plant may be to blame.
Can you find the noise source? Check it's the source by switching it on & off.: Have it checked to ensure it is not faulty, get it fixed or locate it further away from telephone wiring.