This simple tutorial will cover how to enable push e-mail for users who use Gmail or have a Google Apps account on an iPhone, iPad, or iPod Touch.

Gmail is ad-supported and available in 72 languages all over the world. Gmail was also the first app on the Google Play Store to achieve one billion installations on Android devices.

Google's official Gmail app for iOS devices is another solid choice, but it doesn't let you add non-Google email services. It only supports Gmail accounts.