Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great phone unless you like using a headset.

This phone is completely unusable with every headset I've tried so far. I'm told by Panasonic's Customer Service Dept. that I must use one of the bulky, clumsy, uncomfortable looking Panasonic headsets. I'm pretty sure that this is a sales ploy, and their headsets won't work any better. This is such a great phone in every other respect, which makes that problem with the headset even more disappointing. I would have given it 5 stars otherwise.