How reliable are unlock code vendors

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.

- = - Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist

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