iOS 6 - How to get turn-by-turn navigation for older iPhone (3G, 4)

iOS 6 - How to get Siri and turn-by-turn navigation for older iPhone (3G, 4):

1. Sell your old iPhone through any of these websites:
1. http://www.gazelle.com/iphone
2. http://iphonetraderexpress.com/
3. http://www.selltronix.com/product_listing/sell-iphone-trade
2. Get an Android (even older Android 2.2 phones have free turn-by-turn navigation out of the box).
3. Congratulations! You're no longer forced to upgrade by a bully corporation and no longer bound by Apple's scheme of planned obsolescence.