How reliable are unlock code vendors

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I have an old sx56/Wallaby phone I bought used ages ago. I need it to test a
setup I posted here already. I see so many vendors and their prices differ
greatly How do I know who is legit? Shouldn't I be able to get the unlock
code from the mfg for free? Any guides? I already tried xdaunlock in several
ways to no avail.

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Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
http://www.panix.com/~vjp2/vasos.htm
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