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No, you don't have hope for it. You're misunderstanding the documentation for the chipset. It can plex the antenna inputs all into the chip, but DOES need a tuned antenna outside the chip for proper data. Your phone lacks this. It's not going to get any better, you have the same situation as the 8525.
aGPS is supposed to use some sat data IF available, however in most applications it is NOT available, and the antenna signal levels are all sent back to sprint's location server which triangulates your position and sends it back out. Without the proper GPS antenna you have no hope of entering standalone mode properly, you'll be able to yes... But the same as the TyTN you'll end up with nothing but a noise floor signal and no hope of getting a fix.
If you notice in the diagram of your msm7500 you'll see the PCS/Cell antenna can operate alone in duplex mode, or in a triplexed mode with a DIFFERENT antenna, one that is actually tuned to the GPS bands as well. You don't have that. We'd be able to see it inside the phones case if you did (unless I'm completely blind or missing something obvious). Without that antenna it's proof the phone has been built on the duplex design instead...
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