Before the invention of the mobile phones, cordless phones happened to be the most sought after gadgets in the communication world. Even today, in a platform where mobile phones are ruling the roost, cordless phones are still in use globally.
When cordless phones were first launched, they shot into instant fame for allowing people talk wireless up to a fixed range. Cordless phones work using radio waves in various frequencies. Therefore, cordless phone makers manufacture handsets using different frequency bands. For example, in the USA itself, seven frequency bands have been allocated by the Federal Communications Commission. (starting from 1.7 MHz to 5.8 MHz).
The prime advantage of cordless phone is that you get full freedom from clumsy wires while you talk. Secondly, cordless phones come with Caller Identification feature helping you trace who is calling you. They work on rechargeable batteries and are perfect if you need to move around from one room to the other at your home while talking.
There are many online cordless phone shops out there who are selling niche cordless phones from makers like GE, Panasonic, Bellsouth, Sony etc. You can also read cordless phones reviews from users and experts on these sites.