A way to test if you are sensitive to emf is to use the cell phone while in a car for 10 minutes (or maybe 30 minutes if you feel confident emf won't affect you). The radiation emitted from the cellphone gets radiated back at you by the car. However, the difference in emf of different cellphones can be as big as a factor of ten, so I suggest you find out how much emf your phone emits online before doing the experiment, and if your cellphone happens to have a low radiation, borrow a phone with higher radiation.
Look up your phone here:
Cell phone radiation levels - CNET Reviews
There's a lot of unproven things sold as emf protection, which are often sold at unscrupulous prices and without even an attempt to give scientific evidence or measurements of reduced radiation and instead just play on people's fears to get them to buy. In my mind that is as criminal as cell phone manufacturers selling phones to us without telling us about possible dangers.
If you want to protect yourself from emf, either apply to join an Amish community far from cell towers or get a suitable trifield meter (don't be cheap, get something decent) and shield all your radiation emitting things one by one until satisfactory. Also take it with you outdoors and see what kind of radiation you're getting (but don't drive and measure at the same time -_-).
