I won’t link to any of these as no doubt some of them are scams but… If you do a search on ebay.com for “Google Android Unlock” you’ll see that people are already offering unlock codes for the G1 if you send them your IMEI. Whether these people can genuinely offer this already may be doubtful but there is a chance they have a link into an application or person from HTC or T-Mobile which / who can provide this.
There are also unlocked G1′s being advertised in the UK via places such as craigslist. Personally, I wouldn’t go near these at the moment but I’m sure there will be some more legitimate sources of SIM free devices in the near future. Alternatively T-Mobile may provide the device at a price with a pay as you go option, which as I highlighted previously would be great for developers or people who are just curious to try the device out mainly on wifi.
I have read that in the U.S. the 3G on the G1 may not work if a T-Mobile G1 was unlocked and an AT&T SIM was put in the device. I don’t see any such issues being prevalent in the UK. You should be able to unlock the device and switch out the SIM easily enough to O2, Orange, Vodafone or 3 in the UK
However, it will be interesting to see if T-Mobile uses a specific APN for the G1 to restrict access to services for people using other SIMs. This could stop ‘jailbroken’ / unlocked G1′s from getting access to items such as over the air updates (which have been pushed out already in the U.S.). However, this would also limit access to updates for people using the device over Wifi. For that reason, maybe they will look to use a different method such as a T-Mobile sign on to try to encourage users away from unlocked devices.
