> In the Gmail for Android 4.0+ and Gmail for iPhone and iPad apps, you'll see your Primary mail when you open the app and you can easily navigate to the other

> In the Gmail for Android 4.0+ and Gmail for iPhone and iPad apps, you'll see your Primary mail when you open the app and you can easily navigate to the other tabs. And if you don't have Android 4.0+, if you enable this feature you won't be able to see half of your emails - because apparently updating apps for older versions of Android is really hard, despite literally everyone except the people that made Android having no problem doing it whatsoever. (note to those not on Android: some of Google's own apps only update in lock step with the Android version, so you can only upgrade your Google Talk app by upgrading your whole O/S - which in practice often means buying a new phone)