How to update your personal details

It’s really important to keep all your details up to date. We can let you know about changes to your bill, and send you important updates about your account. Plus, we can let you know about our exclusive offers.

You can change your contact number, address details and marketing preferences by following the steps below.

Changing your address

Three app

  1. Open the Three app and log in.
  2. Tap Account at the bottom-right corner.
  3. Tap My details.
  4. Tap the relevant option and follow the on-screen instructions.


  1. Visit
  2. Login using your phone number and password.
    Note: You’ll need to sign up if you’ve not already done so.
  3. Click on the relevant option under My details and follow the on-screen instructions.

Changing your name

If you need to change the name on your account because you’ve married, divorced, or changed your name by Deed Poll, write to us with proof of the name change.

All we need is one of the following pieces of information:

  • A copy of your marriage or civil partnership certificate. If you don’t have one, a copy of your passport and a recent utility bill is also acceptable.
  • A copy of a Deed Poll.
  • A copy of the decree absolute - if you’re divorced and want to use your maiden name.

Remember, we only need one of the above, and not all three!

One more thing. When you do write to us, remember to include a cover letter requesting that your name be changed.

Here’s the address:

Three Customer Services
PO Box 333
G2 9AG

Changing your email address

To change your registered email address, please get in touch. We'll run through some quick security questions and update your info.

Changing other details on your account

Follow the links below for instructions on how to change other details on your account.

For anything else, including changing your number or the named owner of the account, contact us and we’ll be able to help.

If you can't find what you're looking for, we're here to help. Get in touch any time.

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