...

Gmail and Google Calendar apps for iOS

We strongly recommend downloading and using the Gmail and Google Calendar apps from the Apple AppStore. These apps are free and offer more integration with Gmail than the built-in apps. Using the built-in apps may also cause compatibility issues with Duo, our Two-Factor Authentication system, when iOS updates are pushed out to your devicesdevice.

Gmail app:   https://itunes.apple.com/app/gmail/id422689480?mt=8

...

At the sign-in page, Choose "Google", and enter your email address at swarthmore.edu.

On the next page, enter your Swarthmore username and password.

Choose your method for Duo authentication.

...