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Gmail is a free email service provided by Google. Using an application on your phone, you can retrieve and send Gmail messages. Before you can use the application, it needs to be downloaded and installed. Follow these instructions to install Gmail.
Before you can install Gmail, you need an Apple ID. If you don't have an Apple ID, you can create one at www.apple.com
Find "App Store"
Log on to App Store if you're asked to do so.
Wait a moment while the application is installed.