SIM locking seemed a non-issue compared to unhelpful cariers. I was unable to find European companies who would sell me a prepaid SIM for an American Cingular phone. There were all kinds of tricks like I needed an address in the destination country to register and refull the SIM, etc. For me, go ahead and lock my phone since I can't get other SIMs anyway.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set