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.

The provider wants you to use their GPS system so they can charge you for it. I'm pretty sure that phone doesn't have a GPS receiver built into it. I looked into GPS for my SLVR, it turned out I needed to buy a $100 antenna.

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


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