Unlocking the iPhone for T-Mobile UK

OK, so I finally got round to unlocking my iPhone and it's running like a charm on T-Mobile UK. I think the problem I was having before was the WiFi network at the hotel blocking SSH/SFTP traffic (this stopped me from copying over the unlocking app to the phone.)

I opted to use the commercial iphone SimFree solution which I got from iphoneunlocked. Another retailer's site has good instructions for using Simfree on OS X.

If you're looking to unlock the phone for free, check out these instructions from PC World that Niqui told me about.