If i plug in my iphone to the computer and update, will it become bricked?

My iphone 4 does not have service anymore. I haven't updated in a while because I didn't want to lose the original youtube app. Someone told me if I plug in the phone to iTunes and try to update, my phone will become "bricked" because something relating to the sim card. What can I do to prevent my phone getting bricked?

Nope, it won't get bricked.