I need to restore my iPhone but don't have a computer to back up files?

There's something wrong with my iPhone where it won't able me to turn on wi-fi. Its greyed out and won't let me swipe to turn it on. I went on their website and they said to reset network settings. That didn't work and it says if that didn't work to do a software reset. I haven't got a computer or any thing to reset my files and I will lose everything. Is there anything else I can do?

You can use an internet cafe computer, or borrow a friend's (Can use google docs/dropbox/flash drive)