Welcome to the forums.
What are you disappointed in? Maybe it's something that can be resolved for you.
As for the unlocking question. Unlocking allows you to use your device on another carrier's network. If you're planning on switching carriers and want to keep your device, then you would unlock it.
Carriers like to push down service books to you device. You can go into Options > Advanced Options > Service Books, delete the service book and the icon will be gone. However, when you reboot, it will reappear. What I do is create a folder (from the home screen, press menu > add folder) and move the icon into the folder (highlight the icon, press the menu key, select move) and the hide the folder (highlight the folder, press the menu key, select hide).
I hope that helps.
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