Can i use school Wi-Fi for my iphone 4?

Ok so i'm in high school and i have an iphone 4 which is running low on the data. I don't really mind if the school look at my history i just want to go to this blogging site which is blocked. I'm pretty sure if use the Wi-Fi it will be blocked on the phone as well but i do wanna try. I just wanna know if they'll know that i'm using the Wi-Fi on my iphone. Will they?

If you're on their Wi-Fi then they you'll be unable to visit that blogging website. My school blocks websites and websites like youtube facebook etc are all blocked.

Usually the school Wi-Fi is locked with passwords

The site is most likely blocked as it comes into the school's network. The Wi-Fi is on the school's network therefore it will be blocked.