After you buy the DID you prepay the service for one month. The first of the next month your DID will be prorated to change the billing date to 1st. The DID will be billed on 1st of every month after that.
After you buy the DID you prepay the service for one month. The first of the next month your DID will be prorated to change the billing date to 1st. The DID will be billed on 1st of every month after that.