Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: The phone went dead after less than three months...

I bought an unlocked version of the K790a on April 27. I like it very much but yesterday, June 20, it suddenly displayed the message "Insert SIM" when I was trying to make a call. I turn it off, checked and cleaned the SIM card and battery contacts. Then I tried to turn it on but the phone refused to do so. A little red light in the infrared port flashes once or several times in every attempt to turn it on.I am not giving one star but two as a guy called Jairo of Sony Ericsson's technical support staff was very friendly and kind. I will have to send the phone to Sony. Pretty bad for such an expensive item.