@ozzie1
https://www.o2.co.uk/help/account-and-billing/your-bill
You’ll get your first bill within four days of joining O2, and you’ll be charged 14 days after you receive it. Your official billing date is usually the date you joined us, and it will be the same every month.
If you joined us on the 29th, 30th or 31st of the month, your official billing date will be the 1st of the following month. Your first bill will be pro rata, which means that we’ll charge you for one full month’s airtime, as well as any airtime you use in those first few days before your billing cycle starts.
If you’ve upgraded your device, your billing date will stay the same.
Your next bill will be pro rata and might include a charge from your old tariff or Airtime Plan.
You can ask O2 to refund you the time up to receiving your sim.
Guide: How to find help & contact O2
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.
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