Blog | G5 Cyber Security

Smartphone Hacking via Phone Call: Is it Possible?

G5 Cyber Security

TL;DR

Yes, a smartphone can be hacked by calling it, but it’s rare and usually requires specific vulnerabilities or the user interacting with something malicious. Modern smartphones are much more secure than older models, but risks still exist. This guide explains how it works and what you can do to protect yourself.

How a Smartphone Can Be Hacked via Phone Call

  1. Exploiting Software Vulnerabilities: Older phones or those with outdated software may have security holes that hackers can use. These vulnerabilities allow malicious code to be injected into the phone when it receives a specially crafted call.
    • SS7 Protocol Exploits: The Signaling System No. 7 (SS7) protocol is used by mobile networks to route calls and texts. Hackers can intercept and manipulate these signals, potentially redirecting calls or sending malicious commands.
      Note: This is more common with network-level attacks than direct phone hacks.
    • Modem Vulnerabilities: Some vulnerabilities exist within the phone’s modem (the part that handles cellular communication). These can be exploited remotely through a call.
  2. Malicious Code via Ringtone or Voicemail: A hacker could send a specially crafted ringtone or voicemail message containing malicious code. If the phone automatically downloads and plays this content, it could become infected.
    • This is less common now due to stricter app store security and operating system protections.
  3. Phishing Attacks: A hacker might call you pretending to be from a legitimate organisation (e.g., your bank) and trick you into downloading malware or revealing personal information.
    • This relies on social engineering, not a direct hack of the phone itself.
  4. Zero-Day Exploits: These are vulnerabilities unknown to the software vendor. Hackers can exploit these before a patch is available.
    • These are rare and often expensive to acquire.

What Can You Do To Protect Yourself?

  1. Keep Your Software Updated: Regularly update your phone’s operating system (iOS or Android) and all apps.
    • Android: Go to Settings > System > System Update.
    • iOS: Go to Settings > General > Software Update.
  2. Be Careful About Unknown Numbers: Don’t answer calls from numbers you don’t recognise, especially if they are international.
  3. Don’t Click Links in Suspicious Texts or Emails: Even if the call itself seems legitimate, be wary of any links sent afterwards.
  4. Install a Security App: Consider using a reputable mobile security app that can scan for malware and protect against phishing attacks.
    • Examples include Bitdefender Mobile Security, Norton Mobile Security, or McAfee Mobile Security.
  5. Enable Call Blocking Features: Most smartphones have built-in call blocking features. Use them to block unwanted calls.
  6. Review App Permissions: Regularly check the permissions granted to your apps and revoke any unnecessary access.
    • Android: Go to Settings > Apps & notifications > See all apps > [App Name] > Permissions.
    • iOS: Go to Settings > Privacy & Security > [Permission Type].
  7. Be Aware of Social Engineering: Be cautious about sharing personal information over the phone, even if the caller seems trustworthy.

Technical Considerations

Exploiting a smartphone via a phone call typically involves sending specific commands or data packets that trigger a vulnerability in the phone’s software. This often requires specialized tools and knowledge of network protocols.

# Example (Conceptual - Do not attempt without proper expertise!)
# Sending AT commands to manipulate modem functionality (highly simplified)
AT+CMGF=1  // Set SMS mode to text mode
AT+CSCS="GSM" // Set character set to GSM
AT+CMGS="+447xxxxxxxxxx" // Send SMS message (replace with target number)

cyber security Resources

Exit mobile version