Unlock my g1 with dev?

[ZING]

THis is my 3rd G1... the first ones I got I was able to unlock them doing a update thing that made the g1 like a dev phone... It's been awhile since I had those and I just got me a new one thats locked... how do I unlock it back to dev so i can root it and install the newest Cya mod rom? I do not have a t-M data card and I did this last time for free by just installing something in the phones boot menu

[sCellphone]

Hey i would add u can but I'm not sure if this will work, but I'm in the process of trying it myself.The android dev phone is sim-unlocked by nature from my understanding. I'm planning to install the dev phone ROM on my phone, then try switching it back to a non-dev and hoping the sim-unlock sticks.

hope this could help u..
thanks...