Hackers can send malicious SMS messages to smartphones using an SMS Blaster, a technique that doesn't require knowing the phone number.
An SMS Blaster acts as an illegal cellphone mast, tricking nearby smartphones into connecting to it by emitting a stronger 2G signal.
These attacks, known as Stingray attacks, exploit insecure rogue cell mast methods to compromise Android smartphones.
While the chances of falling victim to such attacks are low, users are advised to take precautions by changing security settings on their Android devices.