Mobile phones are also used to collect location data. While the phone is switched on, the geographical location of a mobile phone can be determined easily (whether or not used), using a technique called. Use of mobile phones while driving is often controversial. Distracted while driving a motorized vehicle back, increasing the risk of accidents. For this reason, many jurisdictions prohibit the use of mobile phones at the wheel. Egypt, Israel, Japan, Portugal and Singapore prohibit the use of laptop computers and hand hands free; others, including Britain, France and many. At least some new studies that have shown a link between cell phone use and certain types of brain tumors and salivary glands. Lennart Hardell and other authors of the 11 studies magazine 2009 meta-analysis concluded that the use of the phone for at least ten years doubles the risk that are diagnosed with a brain tumour on the same side (ipsilateral) of the head, which prefers the use of a mobile phone. . 0