Canadian member of parliament Matthew Dubé was tracked through his cellphone for days, CBC reported. It all was part of a CBC/Radio-Canada demonstration of just how vulnerable Canada's phone networks are. With Dubé's consent and the help of cybersecurity experts based in Germany, CBC/Radio-Canada learned that Canada's two largest cellphone networks are vulnerable to attack. It involves what's known as Signalling System No. 7— or SS7. SS7 is the way cellphone networks around the world communicate with one another. It's a hidden layer of messages about setting up and tearing down connections for a phone call, exchanging billing information or allowing a phone to roam. Read more and find out how can hackers access even your phone.