1. Get Wired
Using a wired headset can significantly cut down any exposure to radiation while you use your cell phone. wired head sets are much better then the Blue tooth devices.
2. Get Used to do texting
Teens are doing it more than ever. If you spend most of your cell phone time texting or using apps , Your device should remain far away from your brain.
3. Don't use your cell phone as Alarm Clock.
This is (literally) a no brainer.If You use your phone to awake up , you'll probably have it close by your head for hours while you sleep. Don't.