There are lots of Google applications for iOS and desktop ie Drive, Mail and Google+
The video below demonstrates how to sign in to these apps using our simplified single sign on process for Google Apps
The process for Google Mail is almost identical to the Drive method. Follow the video until you get to the stage where you click on Drive/Docs from your websites sidebar. Now you just click the Mail link instead and continue to the mobile version of Google Mail. Now you can just tap back a few times and it’ll log you into the application! If there are any problems with this method please ensure you are signed out of Google services in all browsers beforehand.