A serious security flaw has emerged in the cell exchange system which allows hackers to hear your phone calls.
Besides this, Hackers can even track you, check your messages by using your phone number.
The flaw was first proved by security expert from GermanyKarsten Nohlin 2014 at a hacker conference in Hamburg Germany.
Smartphone users use Signalling System Seven [SS7] for call or message each other.
SS7 acts as intermediacy between mobile networks.
Security researchers have been frequently warning about SS7 protocol flaws.
Anyone could be targeted by such pop in of attack.
In 2014, researcherTobias Engelsaid that some companies sell the method to track anyones phone number.
That, of course, is not controlled by any one customer.
