Using mobile phones for 10 years or more can double the risk of malignant brain tumors, the Internet edition of the British daily The Independent reported on Sunday, citing a new study. You can reduce your exposure to mobile phone radiation with a few simple changes of habit. First of all, don't hold your phone too close -- keep it as far from your face as possible. A study by a research team at Dankook University found that if you keep the top of your phone a short distance from your cheek, at about a 15 degree angle, the exposure to radiation is reduced by one-third. The further you keep the LCD screen and antenna area of your mobile phone from your face, the less radiation you'll be exposed to. Another way to reduce radiation exposure is to use a hands-free speaker or an earphone. And keep your phone away from your body when the dial tone or answer tone rings, because that's when the largest amount of radiation is transmitted. Also, it's a good idea to not talk on your mobile phone for more than 10 minutes at a time. If you feel a burning sensation on your ear or experience headaches while on the phone, stop using it immediately, experts advise.