If you are a Google Gmail User, You would have noticed that there is a new item on the top menu bar, "New GMail Labs!". It is a new testing ground for new features and add-ons for GMail. There are many a features but the IMAP for iPhone caught my eye.
This new feature allows you to Sync your inbox across devices instantly and automatically. Whether you read or write your email on your iPhone, Smartphone or on your desktop, changes you make to Gmail will be seen from anywhere you access your inbox. Another way to use Gmail on your iPhone is through the browser. By going to m.gmail.com you get the full Gmail experience including conversation view, search, and more.
The Video Instruction could be found by following;
Setup GMail on iPhone (IMAP) Google Instructiona Video