← All providers · Last checked 2 November 2026
O2: how to complain, price rises and leaving
A plain-English guide to complaining to O2, its price rises, how to leave and where to go if it doesn't put things right.
Bill Fighter is independent. We are not affiliated with, endorsed by or paid by O2 or any other provider. Names are used only to identify the company.
How to complain to O2
Start with O2's customer services, then make a formal complaint if it isn't sorted. O2's complaints process is set out in O2: How to complain. Keep a note of the date you complained and any reference number.
Ofcom says every provider's complaints code must include a phone number, a UK postal address and an email address or web form for complaints.
O2 price rises
O2
Check your contract. We couldn't confirm the current rise on the provider's own website, so we don't show a figure.
Ofcom's rules mean price rises in contracts taken out from 17 January 2025 must be set out in pounds and pence. If a rise wasn't set out in your contract, or is bigger than it allowed, Ofcom says the provider must give at least 30 days' notice and let you leave within 30 days without exit fees.
Cancelling or leaving O2
- If your minimum term has ended, you can usually leave by giving the notice your contract requires. If you're still in contract, early exit charges may apply, so check first.
- Mobile: text "PAC" to 65075 to get a code to switch and keep your number, or "STAC" if you don't want to keep it.
- Near the end of your contract, O2 must send you an end-of-contract notice with your current and future price and its best deals.
If O2 doesn't sort it out
Ofcom lists O2 as a member of CISAS, one of the two free alternative dispute resolution (ADR) schemes for phone and broadband. You can go to it once at least six weeks have passed since you first complained, or sooner with a deadlock letter, and within 12 months of a deadlock letter. (For complaints made before 8 April 2026 the wait was eight weeks.)
Free letters
- Mobile: price rise letter
- Mobile: out of contract letter
- Mobile: poor service letter
- Mobile: billing error letter
- Mobile: cancel or leave letter
- Phone contract: price rise letter
- Phone contract: out of contract letter
- Phone contract: poor service letter
- Phone contract: billing error letter
- Phone contract: cancel or leave letter
Add O2 as the provider and your details fill in the letter for you.
Guides
- Mid-contract price rises: can I leave?
- Ofcom end-of-contract notifications
- How to haggle your renewal
- Price-rise calendar and free alerts
Quick answers
How do I complain to O2?
Contact O2 and make a formal complaint using its complaints code (linked on this page). Ofcom says every phone and broadband provider's complaints code must include a phone number, a UK postal address and an email address or web form.
Which ombudsman covers O2?
Ofcom lists O2 as a member of CISAS. It's free to use.
When can I take a O2 complaint to CISAS?
Ofcom says you can go to the ADR scheme once at least six weeks have passed since you first complained, or sooner if you get a deadlock letter, and within 12 months of a deadlock letter. CEDR says complaints made before 8 April 2026 needed eight weeks.
Can I leave O2 if my price goes up?
If the rise was set out in your contract in pounds and pence, you generally can't leave penalty-free because of it. If it wasn't, or it's bigger than your contract allowed, Ofcom says the provider must give you at least 30 days' notice and let you leave within 30 days without exit fees.
Sources
- O2: How to complain
- Ofcom: making a complaint and using ADR schemes (updated 6 August 2026)
- CEDR (CISAS): help and guides – 6-week rule and complaints made before 8 April 2026
- Ofcom: Telecoms price rises – what are your rights?
- Ofcom: switching broadband provider
- Ofcom: companies must tell customers about their best deals
Last checked 2 November 2026. Policies change, so check the linked pages and your own contract before you act. General information, not legal or financial advice.