Phone calls put strain on the heart.
A new study conducted on more than 200,000 Brits found that phone users had a seven per cent higher risk of increased blood pressure compared with those who do not use a mobile regularly.
People who chatted for 30 minutes per week had a 12 per cent higher risk and more than six hours spent on the phone each week increases blood pressure risk by a quarter - significantly increasing the chance of suffering a heart attack or stroke.
Professor Xianhui Qin wrote in the European Heart Journal: "The number of minutes people spend talking on a mobile matters for heart health. More minutes mean greater risk.
"Use of a hands-free set-up had no influence on the likelihood of developing high blood pressure.
"More research is required to replicate our results, but until then it seems prudent to keep mobile phone calls to a minimum."