I purchased my first system to improve my cell phone reception and I was so impressed I purchased a couple Uniden model 905 extension phones and also hooked it to the land line. I then purchased a second system for my office also utilizing the cell phone connection capability along with the land line. It works so well I cannot tell the difference between my land line and the cell phone except by looking at the phone screen. I also live where there are frequent power interruptions and the back-up capability of the units is outstanding. Only caution is you have to read and follow the instructions carefully in connecting to the cell phone. When the cell phone is connected, you have to use the Uniden base instead of the cell phone, but the Bluetooth connects and disconnects automatically when walking away from the base. A very reliable system.