Google updates Gmail for iOS to fit larger screen on Apple iPhone 5
Those Apple iPhone 5 users who love Gmail will be happy to hear that it has been updated for the 4 inch display. The update is available right now at the Apple App Store. Not only does it let you read and write using the highly regarded service, and also allows for push notification of new mail.
Yes, there are many iOS users who prefer Gmail over the native mail application on iOS devices. The app now also supports CardDev, an open protocol for contact syncing. With this new service you can edit, add, and remove contacts from your device and keep them in sync everywhere you use them.
source: AppStore via MacRumors