How to stop a iOS update without a computer?

I know it was stupid to do but I don't have my computer with me and I clicked update software (on my iPhone 5) but then it said to connect to iTunes and I don't have my computer for the next month… Anyway to stop it?

You can do it from a free Wi-Fi- hotspot, or go to an apple store they do it for nothing, from laptop, or just say remind me later?