Why can’t I install my own GPS software on my Smartphone?

I have a Samsung Blackjack 2 Smartphone. My question is that it has the option of TeleNav, meaning that the phone has GPS, but when I try to install my own GPS software (INav) it says that “this software was not intended for this device” or something to that effect.

Why can’t I install my own GPS software on my Smartphone?


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