When you upgrade, the following conditions apply:
If you upgrade before the trial is over: Any remaining, unexpired Free Trial credits remain in your Cloud Billing account. You can continue to use the resources you created during the Free Trial without interruption.
For resources you use in excess of what's covered by any remaining credit, your form of payment on file is charged (credit card or bank account).
If you upgrade within 30 days of the end of the trial: Your resources are marked for deletion, but you might be able to recover them. Learn more about data deletion on Google Cloud.
If you upgrade more than 30 days after the end of the trial, your Free Trial resources are lost.
If you want to use GPUs in your project, please Upgrade from a Free Trial account to a Paid account, and then Request for a Quota Increase from the "IAM & Admin" > "Quotas" page. Afterwards, our Quota Increase team will contact you for any other requirements you'd need to confirm or whether or not your request has been approved.
By upgrading to a Paid Account, All the Free Trial Restrictions on your account will be lifted and you will be Billed normally. You can still use your free trial credits for any charges made on your account. However, once you use up all your credits, any further charges will be billed to your account.