How to delete all Gmail emails at once on phone?

To delete all Gmail emails at once on your phone, you can follow these steps:

1. Open the Gmail app on your phone.
2. Tap on the menu icon (three horizontal lines) in the top-left corner of the screen.
3. Scroll down and select "Settings" from the menu.
4. Tap on your Gmail account.
5. In the Account settings, select "Manage your Google Account."
6. In the Google Account settings, tap on "Data & personalization."
7. Scroll down and find the "Download, delete, or make a plan for your data" section, then tap on "Delete a service or your account."
8. Authenticate your account by entering your password or using Touch ID/Face ID.
9. Scroll down to the "Delete a Google service" section and tap on "Delete a service."
10. On the next screen, find and tap on "Gmail."
11. You'll be presented with options to either "Delete products" or "Download data." Choose "Delete products."
12. Confirm that you want to delete the Gmail service by tapping on the trash bin icon next to it.
13. You'll be asked to provide an email address where you can be reached and to enter your current password to continue the deletion process. Follow the prompts to complete the process.

Please note that deleting the Gmail service will remove all your emails, contacts, and other data associated with your Gmail account from your phone. Make sure to back up any important information before proceeding.