I don't think you have to do anything unless you're going to change your SIM card. And even then, I was reading that a paperclip will do the same thing!!! Just put it in a safe place in case you ever need it!!
The SIM card is what gets you on the 3G network, the tool is used to remove the card if you want to (are able to) change networks and need to install a different SIM card.
I hope that your question is answered now, if not, ask away until you get the information you're looking for!