For many young women today, tucking cellphones in the bra has become a cool, hip way to have easy access to these electronic devices. Women can jog, drive, shop or sit in darkened movie theaters, quickly responding to tingly vibrations at their breast. Most women have no idea that cellphones are two-way microwave radios that should not be kept directly on the body warns Environmental Health Trust (EHT), a group promoting safer phone use especially for non-adult users and for pregnant users.