i just got my stealthsim, cut my tmobile sim card and attached it to the stealthsim. when i turn on my phone, it pops up with "no sim card installed" and up in the top left corner were it should say my provider, it says "no sim" can somebody help me.

Move your stealthsim a few millimeters.. its in incorrect position ! and try again...

Also, try posting the question on the right forum too: http://www.hackint0sh.org/forum/forumdisplay.php?f=124

Good luck!

Stealthsims are crap, I have used about 45 of them, they are unreliable, and dont work with older sim cards. Get a new sim card and try again. If it still doesnt work its because you tried using it with the old sim card. Send it back.