The 5.8 GHZ cordless phone line utilizes the highest frequency band available for use in the United States. As the frequency goes up, the amount of interference goes down. So if you are seeking a cordless phone with the least amount of interference then you should consider the 5.8 GHZ frequency band. Of course with less interference you get increased call clarity too.
Most major manufacturers are producing cordless phones in the 5.8 Ghz band so you have a very wide selection to choose from. Along with the frequency band you should also consider things like, Bluetooth enabled, Wi-Fi capable phones, systems that use a single base station with multiple handsets along with any other feature you need for your specific application.
