Can I just share my poor experience with HTCSimUnlock.com.
Got the wife a new HTC Wildfire, which needed unlocking, so I had a scoot about a couple of threads on here and HTCSimUnlock.com seemed to be OK. So I paid my fee and waited for my code. Needless to say, it didn't go well. 20 minutes later I got an email back from them saying they couldn't find the code, but they had an *EXCLUSIVE* service for a deep search that I couldn't get any place else, but it would cost me the same money again. So started looking for the process to start this fully automatic refund they are supposed to offer. Nothing, I even tried with a second browser just in case Firefox has not showing it. So I ended up emailing them.... and again, and again. Nothing, other than spam offering insurance and backup services for the code they never sent me.
I've sent it to the credit card people as a fraud now, and it's up to them to chase these people.
I ended up going to a UK unlocker who were charging the same fee HTCSimUnlock.com tried to charge by deception, but at least they had the decency to stipulate before hand that newer handsets would cost more.
Needless to say, I would not recommend these people(person) Their claim of an automatic refund is untrue.