O2 Call Forwarding and Divert
O2 makes it straightforward to set up call forwarding on your mobile. You can use universal GSM star codes, your phone's built-in settings, or the My O2 app. This guide covers all three methods so you can choose whichever is most convenient.
Method 1: Star Codes (Quickest)
Open your phone's dialler and enter the appropriate code. These are universal GSM codes that work on O2 and all O2-powered MVNOs (giffgaff, Tesco Mobile, Sky Mobile, Lycamobile).
| Divert Type | Activate | Cancel |
|---|---|---|
| All calls | **21*[number]# | ##21# |
| When busy | **67*[number]# | ##67# |
| No answer | **61*[number]# | ##61# |
| Unreachable | **62*[number]# | ##62# |
| Cancel all diverts | — | ##002# |
Replace [number] with the full destination number including the leading zero.
Method 2: My O2 App
- Download and open the My O2 app (available on iOS and Android).
- Sign in with your O2 account credentials.
- Navigate to My Device > Call settings.
- Select Call forwarding and choose the type of divert you want.
- Enter the destination number and confirm.
The My O2 app is particularly useful if you want to manage forwarding remotely — for example, an IT administrator setting up diverts on behalf of a team member.
Method 3: Phone Settings
You can also configure call forwarding through your handset's native settings. See our dedicated guides for iPhone and Android step-by-step instructions.
O2 Call Forwarding Costs
Activating and deactivating call forwarding on O2 is free. However, forwarded calls are charged at your standard O2 call rate. If you have inclusive minutes in your plan, forwarded calls will use those minutes. Once your allowance is used, standard per-minute charges apply.
O2 Voicemail and Call Forwarding
By default, O2 forwards unanswered and unreachable calls to your voicemail (number 901). If you set up your own call forwarding for these conditions, it will override the voicemail divert. To restore voicemail, cancel your custom divert with the relevant code or dial **61*901# to re-enable it.
Tips for O2 Business Customers
If you are on an O2 Business plan, your account administrator can manage call forwarding settings through the O2 Business portal. This is useful for configuring diverts across multiple lines without needing physical access to each handset.
Need advanced call routing for your O2 business mobiles? Connection Technologies can integrate your O2 lines with VoIP systems, hunt groups and intelligent call flows. Contact us to discuss your requirements.
