We can definitely answer those questions for you. Your plan will renew every 30 days for a total of 12 renewal periods, so the 8GB of high-speed data is renewed every month along with your plan. After you make the advance payment of $300, your service is available for a total of 360 days. If you'd like to take advantage of this promotion again after the 360 days has passed, you'll be required to make another $300 advance payment. You can absolutely Bring your own phone to AT&T PREPAID by following the steps at the link provided. The $300 advance payment will be due at checkout online. This plan does include unlimited talk and text within the U.S., Mexico & Canada. It also includes data usage within & between the U.S., Mexico & Canada. Let us know if you have any further questions or concerns.
Sean, AT&T Community Specialist
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