I'm leaving for a trip in a few days and there are lots of these "unlocking" services online (craigslist, etc.). I'm wondering if anyone knows how these are supposed to work? Most of them cost in the range of $30-50 but they don't make mention of the Gevey Sim route. Anyone know if there is any credibility to these things? They say it unlocks 4.10.01 and does not void your warranty. Thoughts? I was planning on going tomorrow to check it out as I leave for Europe on Thursday.