Apple is not relying any more on Google Maps so that the company has introduced its own Maps app in iOS 6. Now, if you want to enable 3D Maps on your iPhone 4, iPhone 3GS or iPod Touch 4G then continue reading after the break, as officially it does not support older iDevices.
How to Enable 3D Maps on iPhone 4, 3GS or iPod Touch 4G
Requirements:
Jailbreak your iDevice over iOS 6
Install Cydia
Step-1
On your jailbroken iDevice navigate to Cydia and install iFile
Step-2
Download and install the 3D Enabler package
Step-3
Kill Maps app on your iDevice and again open it. You will find 3D Maps icon on Spring borad
See also:
Download iOS 6 beta
iOS 6 Features
Jailbreak iOS 6 Beta
iTunes 10.6.3
WWDC 2012 Keynote