Hi want to ask,

Currently eyeing on iPhone 2G and its in my budget somehow for used.
I want to ask, is anybody using external GPS with it?
I found this https://www.orangegadgets.com/shop/product_...80110e937a36dbb

Is there any other?

Why not iphone 3G?
1. Not in my budget
2. 3G but without videocall is useless to me