I use it for the Link2Cell feature. No landline. Seems to work well, and the Bluetooth stays connected 24/7 so far. Clear sound. Note that the cell phone takes the message; The Panasonic base does NOT take cell phone messages. Base is disabled when using it with a cell phone. I recommend turning on "Cell Line Only Mode" if you do not have a landline (simplifies the system). Set your cell phone to 80% recharge to maximize battery life, too. You can adjust ringer volumes on the handsets (or turn off completely) in the Bluetooth menu, so your house does not have so many phones ringing at once.