SIM Card Question

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http://forums.androidcentral.com – Hello all, I am new to this forum. I'm a n00b when it comes to Android lol. I have a Samsung Galaxy S Fascinate. My friend rooted it and flashed a ROM on it because I didn't know what to do. Now, when I try to turn on my Fascinate, it doesn't startup. So, I'm getting my friend to fix the problem. I have a spare LG Optimus One that I am going to use in the meantime. I was trying to unlock it. I bought an unlock code online but I am having difficulty trying to unlock it. How do I know if it is unlocked or not? I try putting in my SIM card from my Fascinate into the Optimus One but nothing happen (HowTos)