Gmail is easy to operate as these days we can use it from whichever device we have like phones, laptops, computers etc. But IOS operated devices are facing issues such as Gmail’s not updating or not getting notifications after updating the phone and many more.. these can be solved but there is no one way and sometimes there’s no way. You can follow the following steps which might solve your issue:
Step 1: Go to settings of your phone.
Step 2: Check if the two step verification is ON then turn it OFF. Two step verification is for the security of the account but it might create many issues like not being able to access the account etc.
Step 2: Tap on Mails setting.
Step 3: Tap on Fetch data and select every 10-30 minutes.
Step 4: Check the server settings for both POP/IMAP and SMTP.
Step 5: Remove your Gmail account and add it again.
At any point your problem could be resolved or trough any point it would not. If your problem is not getting resolved you can contact Gmail helpline number too.