If you choose monthly payment, all your active monthly-based data plans will be combined on a single receipt each month.
If you choose annual payment, you pay for 12 months in advance per data plan. All annual plans activated at the same time will appear on the same receipt and share the same renewal date.
If you activate additional annual plans at a later time, a new separate receipt will be created, and these plans will then have their own renewal date based on the activation day.