PDA & Smart phone is getting increasingly popular among people.

Many studies have said that use of cell phones is perfectly safe. Then there are studies that link cell phones to cancer. In effect: depends who you listen to, and who you believe. The latest study, by Israeli researchers, purports to link cell phone use and an increase in salivary gland cancer in that country.

Here's a perfect example of why some want Barack Obama to give up his Blackberry. Whether or not you agree with that "demand," hacks like this are a concern.

>When I watched an old 1988 thriller, "Miracle Mile," one of the things that struck me was the huge cellular phone used by Denise Crosby. And even that handset was five years newer than the phone used in the first commercial cellular phone call.

Earlier this week, suspicions arose that text messaging may have played a role in the Metrolink commuter rail tragedy which occurred last Friday. A pair of teenagers told investigators they had been texting the Metrolink engineer, Robert Martin Sanchez, 46, on the day of the Metrolink commuter rail tragedy, and had in fact received a message about a minute before the accident, which left 25 people dead and 135 others injured.