Just my 2 cents.... Orange UK and Steathsim definitely work.... As does Vodafone UK, (I set two up on Christmas day)....
Some ideas...
1) Is your phone defintely jailbroken? I.E. Do you have the installer app running on the iPhone?
2) When you carefully slide the steathsim and orange sim into the iPhone Sim slot, take care to make sure that they slide in together and the sim can steath sta straight....
3) Did you see the video on iphonehellas.com?
http://www.iphonehellas.com/iPhoneHellas/Support.html
4) The Vodafone hack I did on occasion said "No Sim". I slid the sim back out, realigned it etc, and slid it back in. The steathsim and and orange sim should be perfectly aligned (down the side of the iphone sim sled).
Rebooted and then AOK.... Make sure you switch the phone properly off, not just the black screen.
5) Wipe clean the Sim card and Steathsim...
Let us know how you get on...
(We like middle aged ladies here in the UK :-)
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