It's important to know when your payment will be drafted when using AutoPay, honeybunches. I am happy to help clarify. Based on your example, the payment would be drafted on the 7th of each month.
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Also, you can modify the draft date for your AutoPay. Learn more here (#7 explains how to change your AutoPay date): https://www.verizonwireless.com/support/auto-pay-faqs/