Unlocking G1 - Won't show the input screen for unlock code?

I'm trying to unlock my HTC G1. I paid for an unlock code, got the SIM I want and everything, but no matter what I do, it won't show me the input screen where I put in the unlock code (insert sim or whatever it was). I did read the FAQs and try hard resetting, etc. It either gives me the "Welcome to T-Mobile G1" setup screen where you add your Google account (with the sim) or the no sim alert (without the sim).

The Sim carrier (Simple Mobile) is a T-mobile MVNO, is that why it doesn't "reject" the card?

How do I get it to show up?

Thanks very much for any help.

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Had this same problem! Your post and google saved me! My simple mobile card wouldnt bring up the unlock screen either put in my old AT&T card and bingo!

Thanks for the out loud thinking! Hopefully this will help another poor soul as well!

Your phone is not locked to that carrier. You need to use another Sim card to unlock it. Use At&t Sim and im sure, when you'll boot the phone, it will prompt you to enter the unlock code.

Cheers!