As Tulip Mobile is a pre-paid carrier service your bill will be due at the start of your billing cycle. The credit card on file will be charged on the same day as you receive your invoice. All billing cycles renew every 30 days post your activation date.
Please note that the billing cycle is dependent on the day you activated service. Autopay is optional and recommended so you will not miss a payment. You will be notified if a payment has been successful or has failed to process.