Each frequency band can be subdivided into different increments, or channels. For example, while talking on a handset using a 900-megahertz frequency, the base searches for a pair of frequencies (channels) within that range that is not already in use to talk to the handset. This allows the base to search, which allows more discovery of frequencies that will not be interfered with, thus providing better sound quality.

In cordless phones, interference is most likely static. Interference occurs most often with 2.4-gigahertz phones, whether digital or analog, though some have features to minimize conflicts. Interference occurs because cordless phones, home networks, Bluetooth devices, and baby monitors share the 2.4-gigahertz radio frequency bands.

The following tips may help if you are at your wit’s end with the phone you have just purchased:

* Before returning a 2.4-gigahertz analog phone, make sure to try the phone in a location other than the kitchen. Kitchens are not good locations for analog phones on this frequency because they can pick up interference from an operating microwave oven.

* Try changing the channel. Usually, it’s easy—you just push a button or slide a switch.

* When you have two wireless devices that are conflicting, causing interference, try to keep those two devices as far away from each other as possible. See more about: Telephone Problems & Repairs.