Cordless telephones are electronic devices with radio frequency technology. It avoids interference problems and eavesdropping. The cordless phone is available with frequency bands, such as 1.7 MHz, 46 MHz to 47 MHz, 902 MHz to 928 MHz, 2.7 GHz.

In earlier days, analogue cordless phones were used and they used 1.7 MHz frequency band, above the AM broadcast band. It is susceptible to interference from luminous lights.

Bands of 46 MHz to 47 MHz has huge installed base of analogue models. Some of the cordless phones use audio inversion for scrambling. This model chains low-powered walkie-talkies and baby monitors that share the same frequency bands. Unscrambled models are very easily heard by virtually any radio scanner. It provides better audio frequencies with radio scanner.

Models with 902 MHz to 928 MHz band is well known for its use of shorter, non-telescoping antennas. The models cannot be heard by radio scanner with Digital Spread Spectrum (DSS). And the rest analogue models are easy to pick up as it is less crowed than 46 to 47 MHz band. In the technology of cordless telephone you can enjoy 80 channels. A model with 2.7 GHz is the latest cordless phone. To ensure privacy it is available with radio scanner to cover this band and digital spread spectrum with analogue.

When you go to shop for cordless phone, prefer to buy a new cordless phone with 900 MHz or 2.7 GHz band technology. 5.8 GHz digital spread spectrum adopted by FCC which offers improved reception, clarity, range and security over 2.4 GHz. 5.8 GHz frequency bands can incorporate the channel-scanning of spread spectrum to provide you the best response accessible in a cordless phone. 2.4 GHz technology will separate your signal into two different frequencies that makes it free of interference. Spread spectrum cordless is able to spread signal over several frequencies rather than locking onto one.

You can prefer for 900 MHz frequency band cordless phone even if you don't need a top-of-the-line spread spectrum phone. This technology provides clearer signal than 46 or 49 MHz analogue cordless phones. Buying this model you can also save some money. But cordless phone with 46 to 49 MHz frequency bands are good for home use or quiet office.