O2 Voicemail: Number, Setup and How to Turn Off

O2 Voicemail Number

The O2 voicemail number is 901 when calling from your O2 mobile. This is a free call on all O2 tariffs, including pay-as-you-go. If you need to access your messages from a different phone or from abroad, dial +44 7802 090901 and enter your PIN when prompted.

How to Set Up O2 Voicemail

O2 voicemail is usually switched on automatically. To set it up or reset it:

1. Dial 901 from your O2 handset.
2. Follow the voice prompts to create a four-digit PIN.
3. Record a personal greeting or keep the default O2 greeting.

Calls to 901 are free from your O2 phone on all tariffs.

How to Listen to O2 Voicemail

Press and hold 1 on your keypad, or dial 901. New messages are played first. You can replay, save or delete each message using the keypad options. When abroad, call +44 7802 090901 and enter your PIN.

How to Turn Off O2 Voicemail

O2 uses dedicated short codes to manage voicemail:

• Deactivate voicemail: Dial 1760 and press call.
• Reactivate voicemail: Dial 1750 and press call.

Alternatively, dial ##002# to cancel all conditional call forwarding. Once voicemail is off, unanswered calls will simply ring out and you will still receive missed-call notifications. For step-by-step instructions, see our guide on how to turn off voicemail.

Changing Your O2 Voicemail Greeting

Dial 901, then navigate to the mailbox settings menu. Select the option to record a new greeting. Speak clearly and keep it concise — aim for 15 to 20 seconds. A professional greeting is essential if you use your O2 number for business.

O2 Voicemail on iPhone and Android

iPhone users on O2 can use Visual Voicemail via the Phone app. Tap the Voicemail tab to see messages in a list and play them in any order. Android users can access voicemail through the default Phone app or by dialling 901 directly.

O2 Voicemail Costs

Here is what you need to know about O2 voicemail charges:

• UK calls: Dialling 901 from your O2 phone is free on all plans.
• Roaming: Retrieving voicemail abroad is charged as an international call. Rates vary by country — check O2's roaming page before you travel.
• Receiving voicemails abroad: Calls diverted to voicemail while roaming may incur charges even if you do not listen to them.
• Remote access: Calling +44 7802 090901 from a landline or another mobile is charged at your provider's standard rate.

To avoid roaming charges, turn voicemail off before travelling by dialling 1760.

O2 Voicemail Not Working?

If your O2 voicemail is not working, try these troubleshooting steps:

1. Restart your phone — this resolves most temporary network issues.
2. Re-enable voicemail — dial 1750 to reactivate, then test by calling yourself from another phone.
3. Check your signal — voicemail setup requires a network connection. Move to an area with better coverage.
4. Reset your PIN — if you have forgotten your voicemail PIN, call O2 on 202 from your handset or visit My O2 online.
5. Check call diverts — dial *#004# to see where your calls are being forwarded. If voicemail is not listed, re-enable it with 1750.

If none of these steps help, contact O2 support on 202 or visit an O2 store.

O2 Business Voicemail

O2's standard voicemail is suitable for personal use, but businesses typically need more — departmental greetings, voicemail-to-email, call routing and auto-attendant features. If your team handles customer calls regularly, a hosted VoIP system provides far greater control and professionalism.