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No pockets or purse? No problem. It seems more and more women are tucking their cell phones in their bras. But is that safe?

Dr. Rie Aihara is a breast cancer surgeon. She says, "there's a lot of questions regarding whether or not there's association of cell phone usage with cancer."

A new study published in the Journal of the American Medical Association says more women in their 20s and 30s are being diagnosed with advanced breast cancer. One of the authors says toxic environmental exposure and lifestyle changes may be reasons for the increase. 

Dr. Aihara says there are a lot of factors contributing to the increased number of breast cancer cases, and it's difficult to know if putting your cell phone near your breast is harmful. Aihara says, "Unless we ask and unless there's voluntary information we really don't know what the cause and effects are."

Even though it's not directly proven that cell phones are causing cancer, we did find iPhones have a legal notice that advises people to keep cell phones 10 millimeters away from their bodies which is about the width of your thumb.

So what does happen when phones touch your skin? Dr. Aiehara says, "what cell phones do is they emit something called a radio frequency energy which is a type of non-ionizing radiation."

The phone notice says it has been tested and meets applicable limits for radio frequency exposure but some doctors say more research needs to be done. According to Dr. Aiehara, "it doesn't cause DNA damage per se, but it certainly can heat up the body tissue right next to that area."