If you are moving your number to another network you just need your PAC and as soon as it's used your contract ends, so technically, you don't need to wait for 30 days, however, your final bill will include the full month payment.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.