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I'm not sure what you're asking. The unlock works. As far as complications, many with 3GS phones said they lost GPS, but I've yet to see one that had the problem.
 
if you can keep your phone original bb is preferred but if you have no choice then you could upgrade the BB to 6.X.

from the dev team:
Unlockers have been reporting mixed results about GPS functionality at 06.15.00. Until we can track down what differentiates those who retain GPS vs. those who lose it, be conservative and assume you’ll lose GPS at 06.15.00. As we work on finding the cause (and possibly a fix), please report your personal findings in our comments section. (Update: early indications are that while 06.15.00 is capable of GPS, it will require some further hacks. But please still be conservative and assume you will lose GPS at 06.15, in case the hacks don’t work
 
Like my P.R. friend said above.
The unlock is stable and works but you will lose your GPS functionality.
Up to you.
 
It's as stable as any ultrasn0w unlock has been. Sometimes a reboot or repsring or two is needed should signal be lost.

I can verify that 3G service still works, however my GPS only works over wifi and not 3G.

Only if the dev team releases a downgrade method for the baseband will GPS service return.
 
I've just re-jailbroken my iPhone 3G with Redsn0w and the iPad baseband, unlocked with Ultrasn0w but the phone is still locked (searching...)
 
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