Well in order for you to install the unlock, it has to be jailbroken, no way around it. What unlock did you install, ultrasn0w? Im not trying to be rude, but it has to be jailbroken already in order to unlock it.
What carrier was it locked to? What are you using it on?
All present unlocks require jailbreak apps and thus the jailbreak itself. Are you just saying that someone looked at it and said you can jailbreak and unlock?
No okay see it was locked. We couldn't get into any of the icons or anything and it gave a message that the phone needed to be unlocked. So my ex took the phone and unlocked it for my son. Now we can get into the phones icons and i put my tmobile sim card in it and it says function failed everytime we try using it to dial out or get on the internet. It was locked to at&t but now i want to use tmobile.
I take that back. Try this. Connect to a wi-fi connection.
From safari (web browser) on the phone. Go to JailbreakMe (www dot jailbreakme dot com).
Try that jailbreak. You might just get lucky and be on an old enough iOS version for that to work. That is the absolute SIMPLEST jailbreak, which would make this whole thing WOLRDS easier.