Yamada Denshi developed a night vision filter for Vodafone V602-SH cell phones that allows one to see beneath peoples' clothes if the conditions are right. The filter is said to work best when used on dark-colored bikinis.

According to a Vodafone spokeswoman, "We would never go to market with a phone with any kind of capacity to see people naked." She says the company that makes the filter is "not an approved third party."

This make of Vodafone is only available in Japan. Because of issues with voyeurism, many gyms have banned camera phones and South Korea requires that such phones make sounds while they snap pictures.