You can read text messages, listen to phone calls and track mobile phone users’ locations with just the knowledge of their phone number . this works worldwide mobile phone network infrastructure.
The exploit centres on a global system that connects mobile phone networks, and can give You, governments or anyone else with access to it RSP that the user cannot do anything about.
What does SS7 normally do?
SS7 is a set of protocols allowing phone networks to exchange the information needed for passing calls and text messages between each other and to ensure correct billing. It also allows users on one network to roam on another, such as when travelling in a foreign country.
What can access to SS7 enable hackers to do?
Once they have access to the SS7 system, a hacker can essentially have access to the same amount of information and snooping capabilities as security services.
They can transparently forward calls, giving them the ability to record or listen in to them. They can also read SMS messages sent between phones, and track the location of a phone using the same system that the phone networks use to help keep a constant service available and deliver phone calls, texts and data.