Anyone found a way to manually change PRL on LG Optimus G from Sprint?

[jose87r]

I have been trying to change my prl by dialing ##775# but nothing happens with this phone, I was able to do it with my HTC Evo Shift.
Any one tried to do this too? I called sprint and they told me its not possible to do it, but i don't believe them.
Any Help out there will be appreciated.