There are different types of cordless phones that enable an individual with more mobility than talking over telephone. They use radio waves, not wires to transmit conversations from handset to a base unit. The following are the different types of cordless phones in the market:
 
2.4 GHz /900 MHz Digital Spread Spectrum Cordless: The new technology adopted in this system, separate your signals into various frequencies, to free them from interference. It has channel – scanning of spread spectrum to present best reception.
 
900 MHz Digital Cordless:   If you do not require the high quality spread spectrum phone, but still want the benefits of 900 MHz, you can go for a digital 900 MHz cordless. It was originally intended for military, but currently it is presented for common use.
 
900 MHz Analogue Cordless: This model is comparatively cheaper. It does not have digital signal enhancement, but it is sufficient for a small office.
 
46 / 49 MHz Cordless: This is a standard model in use for many years and is adequate for homes and small office.
 
Separate Data Port : If you have a home office, with a separate data port you are able to share a phone jack by plugging your computer or fax machine directly into the phone.
  
The Latest Technology: 5.8 GHz is based on the latest technology. But this model is not freely available in the market. Foremost players in the market release them to show their unique designs.  Therefore 2.4.GHz units dominate the cordless phone market.
 
5.8 GHz Digital: This is the most expensive cordless phone.
 
Difference between Analogue and Digital

The Analogue phones are noisy, susceptible to fading and interference. But digital phones are more secure and have wider range, and free from interference.
 
Range: The range of a cordless phone depends upon the environment in which it is used. Audibility will be better in places where interference from electrical and electronic equipments is less. Range also will be affected by the position of the base stations and antenna. Physical barriers such as walls or even climatic conditions can affect the range. However, choose a cordless phone in terms of its range.
 
900 MHz phones will provide improved coverage than the older model 46 / 49 MHz analogue phones. The latest 2.4 GHz phones will give you better range.
 
2.4 GHz digital phones are based on digital spread spectrum technology (DSS). The DSS handsets will indicate the frequency and spreading code.
 
Power Output: 0.001 watt for 43 – 50 MHz phones. 1 watt for DSS phones in MHz and 2.4 GHz.  And less for non DSS phones in 900 MHz band.
 
A safe Option: 43 – 50 MHz phones can be pulled out on radio scanners and 900 MHz on industrial radio scanners.  But it is impossible to listen in on DSS digitals.
 
Additional features of cordless phones:

1.      Out of range indicator
2.      High or low volume control
3.      Paging / talking from base unit to handset
4.      Dial pad and speaker phone on base unit
5.      Caller ID
 
Where to keep:   The phone can be mounted on the wall if there are children who meddle with phones or to save space on your tabletop. It may be mounted in the corridors/passage for easy accessibility to all.