You have a few options @hml.
How broken is the phone? Can you still use it or is it too broken to use?
If you have a paid for bank account you might be covered there - check the small print, although there will probably be an excess charge.
You could try contacting the manufacturer of the phone to see if they have a repair option.
Otherwise you can try sending it to be repaired by o2 - either go to your local shop or call customer services (link to a few numbers and tricks to get through below):
Guide: How to find help & contact O2
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
