From WHO facts
http://www.who.int/mediacentre/factsheets/fs193/en/:
Quote:
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Several important considerations must be kept in mind when evaluating possible health effects of RF fields. One is the frequency of operation. Current mobile phone systems operate at frequencies between 800 and 1800 MHz. It is important not to confuse such RF fields with ionizing radiation, such as X-rays or gamma rays. Unlike ionizing radiation, RF fields cannot cause ionization or radioactivity in the body. Because of this, RF fields are called non-ionizing.
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Do you believe independent organization more ?
External / extendable antenna will not make any differences in radiation. Even internal antenna can easily make radiation bigger than FCC safety limits.
Using wireless or wired headset do not reduce the radiation on body. Just look at your phone manual, look at FCC certification page, there is SAR Rating on body too. Solution: use speaker phone, or place the phone far away from you.