You can get free unlock code from T mobile.
All you need to do it write to them as the following address:
6 Camberwell Way
Doxford Technology Park
Tyne and Wear
Include your Handset make & model (eg. Nokia 6120 Classic)
Your unique IMEI number (press *#06# on your phone to get this)
Also include a contact telephone number and your name & address (or alternatively, your email address).
Hopefully that should save some of you some searching & more importantly, money!!
Nice find - kudos!
I'm going to give this a try, I hope it works.
Failing that, you could try a i-SmartSim 2008 SIM from dealextreme.com. Been working flawlessly in a T-Mobile locked Pulse for months with no issue.
You may need to cut out a small square shape in the top of the sim to get it to fit, but its dead easy to do and there are tutorials on youtube.
Quite a list of supported phones on dealextreme and only $3.25 with free shipping. Not tried it in my Desire yet - think I'll order another and test ;-)
Sent my letter a couple of weeks ago, still waiting...
Edit: (two months later) Still waiting...
As far as I know, T-Mobile insists on charging you £15 to unlock your phone & insists that you have a contract with them for at least 3 months before they'll unlock the phone. I ended up using an ebay seller to unlock my G1 for £6 which worked fine. Ebay seller was "express-codes" and he gave me an unlock code within twenty minutes or so. Can't complain about that, although a free unlock would have been better! (I believe HTC control the databases for unlocking their phones & they charge for access, so it's pretty much impossible to get a free unlock on recent HTC phones.)
Great! I wrote to T-Mobile at the suggested address. It took about 10 days, but they wrote me with clear instructions on how to unlock my Siemens SL55 phone, and these worked fine. It was FREE! (i.e. it didn't cost a penny). Maybe it is if the phone is old enough and obviously off contract that they do this, but it sure is nice. So thanks DAN -Mike