Iphone 5 update ios 7 no wifi?

Just wondering is there a way to download ios 7 through 3g cause it just says i need wifi, my wifi is down for a couple months and i really wanna try ios 7 is like

Try to connect it to PC and open iTunes then update it. Or you can find some website and download the ipsw of IOS 7 and then install it on tour iPhone. Or try to restart your WiFi's modem or router and try again if it works. You also can update via 3G/4G by going to settings/general/software update. Hope this works.