Toilet paper for smartphones installed in bathrooms in Japan

A helpful video guide, offering advice on using a hi-tech Japanese bidet.

But whether you're a grinder or a sumo you probably aren't wiping your smartphone -- not yet anyway.

Japan's NTT Docomo wants to change that by greeting arrivals at Narita Airport with smartphone loo rolls.

"Japanese toilets are praised world-wide and we wanted to place something like this in our toilets. The toilet may be the very first place people visit after they arrive at the airport, and we wanted them to enjoy Japan while wiping their phones," says Yosuke Chikamura of NTT Docomo.

Smartphones can have five times more germs than toilets seats, according to a study for a weekly Japanese magazine.

But keeping your phone clean isn't the phone company's only aim. Each sheet publicizes the firm's public Wi-Fi network and travel app -- useful tips in a country often criticized by tourists for its surprising lack of infrastructure.

"I wasn't sure exactly how helpful as far as wiping the phone, because it didn't seem like, moist or anything. It was kinda dry, but as far as like the information on it, I think That's pretty helpful for tourists, because you just sitting on the toilet and it's like a moment where you can just kind of look at information," says Brian Ombonga, a tourist from Oakland, California.

Whatever your style you can now wipe your smartphone -- at least until the promotion ends in mid-March.