Does the iOS7 update use data?

Everyone is telling me that the iOS7 update for the iPhone comes out at noon tomorrow, which is when I'm at school. So since I don't have Wi-Fi at school, would updating it use data? And if so about how much?

Yes it does and since its a big update so it must take about ten min to download and it must use a lot of data

Yes its need Data Trasfer So inthat case you need Wi-Fi Connection to Update Via OTA

Of course it would since it involves internet access. I highly recommend you don't use a data connection to download any iOS update. Just wait until you get Wi-Fi to use & do it then.