Instruct: Classify a review into positive or negative sentiment.
Query: Worked for three weeks, and the microphone on the speakerphone died.

This phone worked great for about three weeks, and then yesterday, the microphone on the speaker started to work flakily. It now works less than 25% of the time, and will sometimes cut out in the middle of a call. Additionally, sometimes when I try dialing a number it doesn't register the phone number and will eventually receive an off-the-hook signal. If I hang up and hit redial it will dial fine. The phone also does not have caller id which I would have expected on a phone for this price.