Security and passwords

Security is important to us – that’s why we protect your data with some of the most sophisticated online security and encryption systems available.

What happens if I forget my password or username?

Your username is always your email address.
If you have access to My O2 Business there are two ways you can change your password:

  • On the My O2 Business sign-in page, click Forgotten password? and follow the instructions
  • If you’ve already signed in to My O2 Business, click your name in the Edit my details section on the right-hand side of the page, scroll down and click Change my password

Note: It isn’t possible to reset the password for another user in your business.


How long is a password valid for?

We'll ask you to change your password every 90 days.

How secure is my data?

We use the highest level of encryption on the internet – 128-bit – to make sure your data is as safe as it can be. Website addresses starting with ‘https’ show that you’re using a secure connection – you’ll see this when you sign into your account.

I’m locked out of my phone – how can I unlock it?

If you’ve forgotten the security pin code for your device, you’ll need a PUK code to unlock it.

Small and Medium business and Partner-managed customers

  • To unlock your phone:
  • Sign in to My O2 Business and go to My Account
  • Select ‘Manage device’
  • Click ‘Unlock device’
  • Choose the mobile number you want to unlock
  • Click ‘Request a PUK code’
  • Type your PUK code into your phone to unlock it.

Still locked? Get in touch with your usual O2 Business contact or call us on 0800 977 7337. 

Enterprise customers

If you’re an Enterprise customer, you can request a PUK code, but it will take a little longer for us to sort that for you.

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