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30 LinkedIn Tips: #20/30 – Don’t get hacked

30 short, useful, actionable LinkedIn tips in 30 days from Doctor David Petherick. #30by30 #TheDoctorisIn

#20/30: Don’t get hacked. Use two-step authentication.

  • Originally written: October 20, 2017
    Text & Images Updated: September 11, 2023

Your LinkedIn profile is no good to you if someone else gets access to it with malicious intent.

So here's a simple step-by-step guide to how to use LinkedIn's own security tools and simple two-step authentication to avoid the likelihood of that happening, and to make sure your account is fully secure.

Two minutes of your time following these simple steps could save you from a lot of trouble.

Click to go to Settings and PrivacyStep 1: Add your mobile number

This is a fast, simple and secure key to ensuring you, and only you, can access your LinkedIn profile - because it's very likely that you are the only person with access to your mobile phone.

First, log in to LinkedIn, and then click on your little profile photo at top right to access your security settings - as shown above.

Now you need to click through to the 'Sign in and Security' section of your settings, and choose first 'Phone numbers' and then 'Two-step verification' as shown below.

Two Factor authentication setup

You will see the simple option to add a phone number - by default this is the phone registered as your phone number in LinkedIn.

You can also check what devices are logged in and where, which we'll cover in Step 3.

A shortcut to get here (once you're logged in) is: https://www.linkedin.com/mypreferences/d/two-factor-authentication

Once you've clicked through to Add/Remove Phone numbers, you need to add a phone number - you'll also need to enter your LinkedIn password.

You'll then be prompted to enter a security code. This is sent to you via an SMS message to the phone number you've just added. Once you have verified your number by entering this security code, your phone will be registered to your LinkedIn account. You're done.

Step 2: Activate two-factor authentication

Again, go to your settings, then switch on to activate two-step verification. The steps to follow are self-explanatory.

Obviously, you should set this up and activate it immediately after you add a phone number.

What this means is that, in future, you'll need to enter a verification code sent to your phone number whenever you try to access LinkedIn from a new device - for example your phone or tablet, or a home computer, or if you access it from a new device or IP address if you're travelling. Once you have set up a device, you should not need to verify it again.

If anyone else tries to access your LinkedIn account on a new device and uses your correct password, you'll be notified right away, because you'll receive an SMS message and also receive an email to your main registered email address. But the person won't be able to access your LinkedIn without the authentication code in the SMS message.

By the way, I'd recommend having an additional email address registered to your account. Say personal and business email addresses. For example, among my other email addresses, I use a personal Gmail address, so that I can access my account and notifications using this as a 'fallback' option from any web browser or from my phone.

There is an alternative method of using two-factor authentication, which is to use Google's Authenticator app, again on your mobile phone. This generates a code which you need to enter to login in as a second form of authentication.

Step 3: Check where you're logged on to LinkedIn

Now that you've set up your phone number with LinkedIn, it's worth now checking to see what devices are actually logged in to sessions for your LinkedIn account, and if necessary, signing out from any that are active that might present a security risk.

You'll find this under the same heading of Sign In & Security.

For example, your shared work computer may still be logged in to LinkedIn, or a tablet that other people have access to - and so you can sign out from those devices using this screen.

If some device or location you do not recognise is logged in, sign that device out immediately from here. The fact you can see the location helps you spot anything unusual. If you spot a device logged in in a country you've never visited, sign it out, fast, and change your password!

Step 4: Test a login on a new device or a new IP address

This is a useful step to make sure your new security settings are operational. Try logging on from a new device or browser, or do so from a new location. You'll very likely be prompted to enter a security code as soon as you do this - and this code, of course, will come only to the phone you registered with LinkedIn and to your primary LinkedIn email address.

Enter the security code, and your new device will then be registered as an authorised device.

Step 5: Check your email

At the same time as you carry out Step 4, you'll also receive an email from LinkedIn Security to let you know that access has been attempted from a new device or (in my experience) from a different location. An example of this email is shown below.

LinkedIn Security Email as part of Two-step verification

LinkedIn Security Email as part of Two-step verification

As you can see, you can immediately spot anything suspicious when you get this email, and anyone trying to get unauthorised access cannot do so without entering the security code that is only sent to your designated phone number.

So unless they've got your phone, you're safe from an attack even where the hacker has correctly entered your password. If they have your phone and your password, you're toast. But as you of course have set up and activated the remote kill feature on your phone, even this will not be an issue...

If something like this does happen, it's worth changing your LinkedIn password (the home/mobile email address is useful in this respect) and contacting LinkedIn to inform them. It also goes without saying, that your LinkedIn password should be quite different from your email password. And you should change it regularly.


The simple procedure of linking your mobile number to your LinkedIn account means the chances of unauthorised access to your LinkedIn account are drastically reduced.

So please do it. Right now. There is no time like the present. It'll take you less than two minutes.

About David Petherick

The Doctor is In. I have treated over 34,667 LinkedIn problems for CEOs, professionals and startups since 2006. You'll know by the end of our first free consultation if I can help you. We just need 10 minutes to diagnose and confirm if we're a good fit. Join over 4,767 subscribers to my free LinkedIn Newsletter on LinkedIn with no need to share your email address. Follow me on Twitter at @petherick.