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Here this explanation show how to fix the Gmail not working on iPhone issue
Thing is, when you attempt to connect from a new place, Google often blocks sign-in attempts because it is assumed as a “hacking attempt.” And even if you’re in the same place, sign-ins can be blocked for several reasons.
Follow these tips to get out of the Gmail not working on iPhone problem:
1: Check Alerts by Going to Gmail Site
The Mail app on iPhone doesn’t give details, so visit Gmail site. Enter username and password on gmail.com; iPhone users should ensure they’re visiting the mobile site, not using the Gmail app.
Then, search for an email or alert box with messages like “We blocked a sign-in”. Click “That was me” or “Review devices now” to fix the issue.
2: Go to Google’s Site to Review Recent Devices
Visit “Device activity & notifications” section on “My Account” Google site. See the devices from which your email was accessed and unblock the ones that you used.
After that, Google will let you access your email ID.
3: Perform CAPTCHA Reset
Visit the CAPTCHA reset page of Google to do this, and use your username and password to login.
The next step is to attempt the sign in to Gmail from iPad or iPhone. The sign in should happen, and Google will remember the device so that future problems are prevented.
4: Ensure IMAP is active
In Settings, IMAP may be switched off, so the user may not be able to get email from the server. To switch on IMAP, take help from the internet. Then, come back and try logging in again. If you can’t login or Gmail not working on iPhone again, try the next solution.
5: Delete Gmail Account from iPhone & Add it Again
When you setup the account, you’ll have all your emails back. Follow the steps below to delete your gmail account from iPhone & add it again:
If the Gmail not working on iPhone problem is not resolved yet try to contact gmail support phone number