I purchased a HTC PPC6800 smart phone yesterday, and I noticed today the keyboard would not light up. I called my phone company and they told me to take the phone back and I would get a new one. but last night the light did work, and just now I tryed on a well lighted room and the light stays off, I step in a dark room and the light DOES work(I tryed it several times). but it does not say anything about that on the owners manual. so, do I have a problem or is that how this phones are???? help me