This article explains how to get Gmail on an iPhone by adding your email account information to your phone's settings. Instructions apply to any Gmail email account at either the Personal Use or Workspace level on any iPhone running iOS 11 or later.
How to Sign Into Gmail Account on iPhone
There are two ways to download email to your iPhone: IMAP and POP. You can use whichever you prefer, but IMAP excels at its syncing features. Previous Gmail messages will be downloaded to your phone and stored in the built-in Mail app, where you can also check for new emails and send messages to your contacts.
To install Gmail on your phone using Gmail's IMAP server settings, follow these steps:
Enable IMAP for Gmail.