Can’t Text or Make Calls? It Could Be SIM Jacking

SIM Jacking

You’ve probably experienced the frustration of a smartphone that suddenly dies; usually following a hard drop or software update. But what if only part of it stops working, like the ability to make phone calls and send texts? The problem might not be your phone at all, but cyberthieves who’ve stolen your phone’s identity through SIM jacking.

The subscriber identity module (SIM) is the circuit board that allows your mobile phone to communicate with your cellular carrier. This awesome little piece of technology allows you to buy a new smartphone, move the SIM from the old to the new, and instantly have a working phone. No need to change numbers or re-enter all your contacts! It just knows things, because of the SIM.

Until that SIM is jacked. (SIM jacking is also known as simjacking, SIM swapping and SIM hijacking).

What Is SIM Jacking?

It’s not like carjacking. Cyber criminals don’t need to be anywhere near you (or even on the same continent) to hijack your SIM. They just need enough information about you to convince a person who works for your mobile carrier that they are you.

Where do they get that information? In many cases, they can find it online using search engines and social media. In this business, we call this open source intelligence (OSINT). Or they can purchase it off the Dark Web. Or they can phish you for it. When they have compiled enough of a dossier on you, they simply make a call to your carrier, pretend to be you and say they want the SIM transferred to a new device. Boom, done, your phone is a brick. (OK, a brick that you can play Candy Crush Saga on).

What’s in it for the SIM Jackers?

“So what,” you may be thinking. “Do cyberthieves want to see the 20 texts a day from my mom asking if I’m social distancing?” Not exactly. But they’d be very, very interested in texts or phone calls you get from your bank when you login to your account from a new device for the first time (multi-factor authentication by texts or phone ). Because they have your SIM, those messages and calls will go to them instead, making it far easier to access (and drain) your bank account or other sensitive accounts.

How Common Is SIM Jacking?

Not too long ago, SIM swapping was limited to high-profile, high-return targets, like Twitter founder Jack Dorsey. He was the victim of SIM jacking in August 2019. In his case, it was Dorsey’s Twitter account the thieves were after. They posted offensive messages from his account for about 15 minutes before being discovered and locked out.

But COVID-19 has changed the cybersecurity landscape as criminals look to make the most out of the disruption and isolation that has become the new normal. SIM jacking is becoming more and more common.

What Should You Do if You Suspect SIM Jacking?

Notify your bank and your carrier immediately, as well as any other account locations where you think thieves might be able to do serious damage. If you are an Intrust IT customer, call us ASAP. Our data security experts will work to prevent the hackers from accessing your business accounts with the stolen SIM. You can also visit for information, especially if you think the cyberthieves may have access to credit card numbers or your Social Security number.

How Can You Prevent SIM Jacking?

The single best thing you can do to protect yourself from SIM jacking is to enable multi-factor authentication (MFA) on all your accounts and use an authenticator app (AA). MFA by AA doesn’t send one-time passcodes (OTPs) to you by text or call your phone number to verify your identity. Instead, you use a specialized app (there are several good ones from 1Password, Microsoft and Authy) on your smartphone to receive the OTP that you are required to enter when you sign in. Authenticator apps are not linked to your SIM. In fact, an AA could be installed on a tablet or PC. If you are using an AA, a cybercriminal would have to have physical access to the device that has the AA on it to get the OTP. In that case, SIM swapping would not give the bad guys access to the OTPs needed to sign in to your accounts. To learn more, visit our Multi-Factor Authentication Guide.

Other steps you can take to improve your SIM cybersecurity include:

  1. Use a strong, unique password for your mobile account and change it regularly. Don’t include any personal information like your name or birthday. (HINT: These tips apply to all your passwords).
  2. Ask your mobile carrier to require a PIN code or passcode to make any account changes.
  3. Never give out personal information to someone who calls, emails or texts you out of the blue. Instead, contact your carrier through the phone number on your bills or their public website. In the business, we call this going “out of band.” Whoever answers will be able to deal with any account issues (or special deals) that the caller wanted to talk to you about, assuming the call was real.
  4. Beware of email links and phone numbers. Remember that the bad guys can spoof email addresses and phone numbers to make their messages appear more authentic and legitimate. Rollover links to make sure they’re to trusted sites or type in the URL to where you want to go. For phone numbers, see tip #3.
  5. Don’t share personal information on social media, message boards and other public sites. And be careful where your camera is aiming for those selfies: Sensitive data could be captured in the background.

We should add a step 6 to call Intrust IT! But seriously, if you’re looking to improve cybersecurity and IT support for your business, reach out for a meeting or tell us how we can help. Watch each video and make simple, everyday changes that will help reduce your risks of hacks, breaches and cyber attacks.

P is for Passwords

5 things you can do today to keep your company safe

I is for Insurance and Investments

3 easy things you can do to reduce your risk

E is for Employees

4 ways employees can keep your company safe Get Free Access

Posted in
Dave Hatter

Dave Hatter

Dave Hatter (CISSP, CCSP, CCSLP, CISA, CISM, PMP and ITIL) is a cyber security consultant, writer, educator and on-air media contributor. See hundreds of Dave’s expert interviews on cyber security on his YouTube channel, or tune in to 55KRC every Friday morning at 6:30 for his “Tech Friday” segment.

Share this Blog

Enterprise Password Management Promo Wide

Is Your Name or Birthday a Part of Your Password?

If so, you’re a part of the 59 percent of people who don’t follow proper password hygiene. More than 70 percent of passwords are used for more than one system, meaning if cybercriminals crack one, they can access a lot more accounts.

Our free Enterprise Password Management Guide will give you the best password hygiene practices to help you secure your computer and your business.

Download the Guide

Explore the Latest Trends in IT

Securing Our Cities Cybersecurity Protection for Local Governments - Intrust IT

Securing Our Cities: Cybersecurity Protection for Local Governments

As a city or municipality manager, you understand that the security of your community extends far beyond physical borders. With...
Manufacturing and IoT Securing Connected Devices

Manufacturing and IoT: Securing Connected Devices

You're the operations manager of a cutting-edge manufacturing facility, overseeing a production floor buzzing with activity. Your team relies on...
Small Business Cyber Security Toolkit

Small Business Cyber Security Toolkit: The Tools You Need to Stay Protected

With great power comes great responsibility, especially when it comes to running a business and protecting your digital assets. As...

Business Continuity Plan Template for Municipalities

Municipalities are facing increasing cyber attacks.  With cybercrime rates soaring and municipalities ranking as prime targets, the need for robust...
Cybersecurity Strategies for Municipalities 8 Expert Tips - Intrust IT

Cybersecurity Strategies for Municipalities: 8 Expert Tips

Municipalities tasked with safeguarding sensitive data and critical infrastructure are increasingly the targets of cyberattacks. Municipalities often handle a vast...
Business Continuity Guide for City Managers - Intrust IT

Business Continuity Guide for City Officials

The resilience of a city's operations hinges on its ability to effectively weather unforeseen challenges. From natural disasters to cyber...