Here are the steps to recover a deleted email from the mobile Trash folder:

1. Tap the App Store Icon: The icon is a blue square with a white A inside. It may be located on your home screen or inside the folder of apps.
2. Search for the Email App: Find the email app associated with your email account, like the Gmail app. Tap Get, Download, or Install, and follow the instructions to download the app.
3. Sign In to Your Account: Sign in to your email account, if required.
4. Tap the Trash Folder: Look in the folder labeled the Trash to see if the deleted email is there.
5. Retrieve the Email: Select the email and tap Move To. Select where to move the email to restore it.