You can easily set up your Gmail on a new iPhone by adding your Google account through the Mail settings. Simply open Settings → Mail → Accounts → Add Account → Google, then sign in with your Gmail email ID and password and allow the required permissions. Make sure the Mail option is enabled and tap Save. After the setup is complete, open the Mail app and your Gmail emails will start syncing automatically on your new iPhone.
If you need a quick visual guide, you can follow this step-by-step video tutorial:
If you need a quick visual guide, you can follow this step-by-step video tutorial: