Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One fatal flaw makes this phone useless

As many others have pointed out, this phone does not generate usable tones to operate with phone answering systems. Therefore, it is completely useless as a replacement for your regular phone.On top of that, it has the usual issues of rather poor voice quality, long delays before each side hears the other, echos of your own voice that are so annoying that it makes it almost impossible to hold a conversation, and customer support that had to be called four times only for them to tell me that the lack of touch tones is "under investigation" because of other users' complaints.In other words, this phone will make you very unhappy if you expect it to act like a normal telephone.