My iphone is empty and useless after ios update
The USB pointing to iTunes icon means you need to connect your iPhone to iTunes. I think if you don't have a wifi connection and can't get to any PC with iTunes then you will have to wait until you get either one of those. Maybe you can ask a friend to bring a laptop round or go to theirs. Or try and find a wifi without a password nearby somewhere. Also I think most McDonald's have free wifi. Not sure if this will work as I haven't set up a new iOS device since 4S but go back to wifi and click skip. Then try to use your carrier's cellular network to set it up. Hope this helps.