No if you upgrade then the new deal will replace the old one @Hare
There is a guide about upgrading I will link below
Guide: Upgrading Your O2 Phone
There will be a month where you pay part for the old airtime and part for the new, but that should all sort itself out.
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 Do not publish personal details (email, phone number, bank account).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
