I've had iphone a week and half and have already had it unlocked from a friend of a friend who is an apple engineer.. When he unlocked it there was a unlock icon on desktop.

Now for some unknown reason accept me being a complete dumb *** I restored my iphone!

So i have just tried unlocking my iphone using guided steps on this forum, I didn't complete steps 3 & 4 (ie app tapp) but my iphone is working fine makes calls,msg's and receives emails, so I was just wondering what the unlock icon does and will I need it even though iphone seems to be working ok..?