This bad answer to a valid question (mods may have cleaned it up as a non-answer by the time you get there) prompted me to think that we already have a handful of questions about removing the SIM-lock, or region-lock on a phone (mainly in the unlock tag).
Of course these questions are hardware specific, and in many ways not actually Android specific, but they do keep coming up every now and then.
Do we need a central "How do I remove the SIM lock on my Android phone?" question that can be wiki'd and explain the issues and either link to model specific answers, or list the ones that have come up so far in it?