Three Voicemail Number: Dial 123 — Setup & Access Guide [2026]

The Three voicemail number is 123. Simply dial it from your Three mobile to listen to messages, set up your voicemail for the first time, or manage your greeting. Whether you're configuring a single handset or rolling out voicemail across an entire fleet of business mobiles, this guide covers everything you need to know about Three voicemail in 2026.

How to Call Three Voicemail

Accessing your Three voicemail is straightforward:

1. Open your phone's dialler app.
2. Dial 123 and press call.
3. Follow the automated prompts to listen to, save, or delete messages.

Calling 123 from your Three handset is free of charge and works on all Three pay monthly, pay-as-you-go, and business contract plans. You can also press and hold the 1 key on most devices to speed-dial voicemail directly.

First-Time Voicemail Setup on Three

If you've never used voicemail on your Three SIM before, you'll need to complete a brief setup process the first time you dial the 3 voicemail number.

Setting Up Three Voicemail on iPhone

1. Open the Phone app and tap the Voicemail tab at the bottom right.
2. Tap Set Up Now if prompted.
3. Create a voicemail PIN (4–7 digits). Choose something memorable but secure — avoid obvious codes like 1234.
4. Record a custom greeting or select the default greeting.
5. Tap Done. Your voicemail is now active.

Alternatively, dial 123 from your iPhone and follow the voice prompts to complete setup manually.

Setting Up Three Voicemail on Android

1. Open the Phone app and dial 123.
2. The automated system will detect that your voicemail hasn't been configured and walk you through setup.
3. Set a voicemail PIN when prompted.
4. Record your personal or business greeting.
5. Your voicemail is now ready to receive messages.

On some Android devices, you can also navigate to Phone app → Settings → Voicemail to configure your voicemail number. Ensure it is set to 123.

How to Set or Change Your Three Voicemail PIN

Your voicemail PIN protects your messages from unauthorised access — particularly important for business users. To set or change it:

1. Dial 123 from your Three mobile.
2. Navigate to the mailbox settings menu (typically option 3, then option 2).
3. Select change PIN.
4. Enter your current PIN (if applicable), then enter and confirm your new PIN.

Tip for business users: Ensure all employees set unique PINs on company handsets. Default or unset PINs can leave sensitive voicemail messages exposed.

How to Access Three Voicemail Remotely

If your Three handset is lost, broken, or switched off, you can still retrieve your voicemail messages from another phone:

1. From any phone, call your Three mobile number.
2. When the voicemail greeting plays, press the * (star) key.
3. Enter your voicemail PIN when prompted.
4. You'll be connected to your voicemail inbox as normal.

Remote access requires a voicemail PIN to be set up in advance. Without one, you won't be able to authenticate. This is another reason to configure your PIN during initial setup.

Visual Voicemail on Three

Visual Voicemail lets you see a list of your voicemail messages on screen and choose which ones to play, rather than listening through them sequentially. Here's how it works on Three:

Visual Voicemail on iPhone (Three)

iPhones on Three support Visual Voicemail natively. Once your voicemail is set up:

1. Open the Phone app.
2. Tap the Voicemail tab.
3. You'll see a list of all messages with caller information and timestamps.
4. Tap any message to play it. You can also read voicemail transcriptions where available.

Visual Voicemail on Android (Three)

Visual Voicemail availability on Android varies by device and model. Many newer Samsung Galaxy, Google Pixel, and other flagship devices support it on Three. Check your Phone app → Voicemail settings to see if the feature is available on your handset. If Visual Voicemail isn't supported, you can always dial 123 to access messages in the traditional way.

How to Turn Off Voicemail on Three

Some business users prefer to disable voicemail entirely — for example, to ensure missed calls result in a callback rather than a message. To deactivate Three voicemail:

1. Open your phone's dialler.
2. Dial ##002# and press call.
3. You'll see a confirmation message that all call diversions have been cancelled.

This removes voicemail for all scenarios: when your phone is busy, unanswered, or unreachable. To reactivate voicemail later, dial **61*+447782333123# and press call. You should receive a confirmation that conditional call forwarding has been re-enabled.

Note: The divert codes above are standard across Three UK, but if you encounter any issues, contact Three business support or speak to your account manager.

Three Voicemail Tips for Business Users

• Record a professional greeting: Include your name, company name, and an alternative contact method. This makes a strong impression on clients and suppliers.
• Check voicemail regularly: Unanswered voicemails can mean missed opportunities. Consider setting a team policy for response times.
• Use voicemail-to-email: Some business mobile plans and unified communications platforms can forward voicemail recordings to your email inbox for faster processing.
• Review your mobile plan: If your team relies heavily on voicemail and call management features, make sure your Three business plan is optimised for your needs.