How Hackers Exploit Call Forwarding Attacks on Mobile Phones (And How to Stay Safe)

Introduction

In today’s digital era, our smartphones are not just communication tools-they’re gateways to our personal and financial lives. Hackers know this, which is why they’ve devised a clever trick called a Call Forwarding Attack. This method allows cyber criminals to redirect your calls and SMS messages to their own number, giving them access to sensitive information like banking OTPs and login codes.

What is a Call Forwarding Attack?

Call forwarding is a legitimate feature provided by telecom companies, designed to reroute calls to another number when you’re busy, unreachable, or unavailable.

However, attackers exploit this feature to silently divert your calls and messages. Once active, your one-time passwords (OTPs), banking alerts, and even personal calls may go directly to the hacker.

How Hackers Hack Mobiles Using Call Forwarding

1. USSD Code Exploitation
   Hackers dial special USSD codes (like *21*number#) to activate call forwarding without your knowledge.
2. If they briefly access your phone, they can set this up in seconds.
   

How to Check if Your Calls are Being Forwarded

You can quickly verify whether call forwarding is active on your number by dialing:

• *#21# – Shows if calls are forwarded
  
• *#62# – Checks forwarding when unreachable
  
• #67# – Checks forwarding when busy

To disable all forwarding immediately dial

• ##21# – Deactivates all call forwarding

Safety Precautions for Mobile Users

Here are simple steps to protect your mobile from call forwarding hacks:

• Set a SIM PIN – Prevents misuse if your SIM is removed.
• Use App-Based 2FA – Switch from SMS OTPs to authenticator apps.
• Avoid Suspicious Links & Apps – Only download from official stores.
• Monitor Call Behavior – If calls/SMS suddenly stop, check call forwarding settings.
• Stay Alert – Don’t share OTPs or telecom PINs with anyone.