Your first invoice covers two periods and is therefore usually higher than a regular monthly invoice:

– Pro rata of your activation month. From the day your number became active until the end of that month.

– Full following month. The regular monthly amount for the first full month.

An example: your number becomes active on 15 September. Your first invoice (early October) will contain:

– Pro rata 15-30 September: 16/30 days of your subscription

– Full month of October: 31 days of your subscription

From the second invoice, you simply pay the monthly amount of your subscription, plus any additional options or consumption outside your subscription.