I've had success using toothpaste [preferably with whitening] + a cotton swab. Slightly dampen the tip of the swab, and put a smidge of toothpaste on the top. Work that into the LCD screen [like...
put toothpaste on it.. and rub it around with a paper towel or a rag and the wash it off... this procedure also works on cds.. it works suprisingly great.. =]
Depends on the Phone. I`m asumming you mean a smart phone or an I Phone i know that you can not on a My Touch and i doubt you can on any other type of smart phone as well. The I phone is usually more...