Call forwarding
Forwarding to Tirza when you're with O2 (UK)
On an Odido plan? Here's how to forward your number to Tirza in 2 minutes.
Last updated: 20 April 2026
Forwarding to Tirza when you're with O2
Odido used to be T-Mobile. Still on an old T-Mobile bundle? This article works for you too — same network.
What you need
- Your mobile
- Your Tirza number (on your dashboard)
Step 1 — Choose your flavour
Forward everything: every caller goes to Tirza. Only when you don't pick up or are busy: your phone rings first — Tirza only takes over if you don't answer.
Step 2 — Tap in the code
Forward everything:
**21*[tirza-number]#Only when you don't pick up or are busy:
**61*[tirza-number]*11*30#Press the green call button. You'll see a confirmation message on screen.
Step 3 — Via the Odido app (alternative)
Prefer tapping over typing codes? No problem:
- Open the Odido app on your phone
- Go to My subscription → Settings
- Choose Call forwarding
- Enter the Tirza number
- Choose "Always" or "When I don't answer / busy"
- Tap Save
Step 4 — Test
Have someone ring you. Or use the test call button on your dashboard.
Turning it off
##21###61#
Or in the Odido app: Call forwarding → Turn off.
## Problems?
**"Code rejected"**
On Odido sometimes needed: pop your phone into airplane mode and back. That re-registers it on the network. Then try the code again.
**"It just won't work"**
Check you've typed the Tirza number exactly right. One digit off = forwarding won't work. Copy it from the email, don't type it from memory.
Stuck? Email hello@tirza.ai and we'll help you within 2 hours.
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Still got questions?
Email hello@tirza.ai — a real person replies within a few hours.
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