If I update my iPhone to iOS 8.3, will it remove any of the data on the iPhone?

If I update my iPhone to iOS 8.3, will it remove any of the data on the iPhone? - 1

Added (1). I have an iPhone 5 with 6.0.1, I want to update to iOS 8.3 but I'm afraid it will delete the data on the phone (includes photos contacts and other apps) will it?
it happened to me once before and I don't want it to happen again

Well when my friend updated hers, she still had everything. When I updated mine it deleted all of my videos and some photos. So to be quite honest, I'm unsure!

Depends if your updating from like ios 7 to 8, but its possible so go to settings>icloud and back up all your data and info… Look it up if your confused about how to back up data.