Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Watch out! This is a one line phone.

I just purchased one and it's going back. Here is what the guide states: "Your Four-Line Speakerphone is a full-featured phone ideally suited for home-office use. It is designed to receive calls on up to fourincoming telephone lines and to serve up to 16 station users."In fact, if you are on the base station using one line, the handset will not let you make a call on line 2. Same is true in reverse. Customer service at Thomson said that the extension is "for mobility only", and could not explain the 16 extension keys. Rather interesting engineering, eh? For multi-line operation, they suggestes the model 25450.