Darbird’s billing cycle for phone numbers is monthly and starts on the first of every month. Darbird will charge on the 1st of every month. You will be billed for the numbers available in your account depending on the monthly rentals, as of that day.
Please note that monthly rental fees are charged irrespective of whether or not the number was used. If in the middle of a billing cycle the phone number has been purchased, rental fees are charged on a prorated basis. For example , if you purchase the number on the 1st of the month, if a number, whose monthly rental is $1, you will be incurred $1. However, if you buy it on the 18th day of the month, the rental fee is charged only for the remaining days of that month.