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Google maps was a built-in app with iOS 5.1.1 and earlier. The only way to get it back is to downgrade to an earlier iOS release.
 
really easy! just restart your phone while holding the home button. when you see the apple logo, press the volume up button 3 times.

and you should see google maps back on your phone! 🙂
 
Simple:

Step 1) Wait for Google to submit a maps app to the app store
Step 2) Wait for Apple to approve the new maps app
Step 3) Install the new maps app from the app store.

See, easy! 😀
 
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