Do you trust Uniquephones/iphoneunlocking.com?
Be cautious about Uniquephones/iphoneunlocking.com. Remember they were claiming to have unlocked tens of thousands of iPhones within days of the release! See this story from July 6: http://www.theregister.co.uk/2007/07...one_unlocking/
They are still doing what they did then: put up a web page to grab IMEI numbers and e-mail addresses. No further information is available and they don't reply to e-mails.
They may well have a software unlock solution - it is their business - but their actions suggest that they may not be the best people to send your personal details to.
The other solution (iphonesimfree) has at least been verified by Endgadget and appears to be restore resistant.