Will I lose my data if I update my iPhone?

My iPhone 5 is still version 6.1.4, I have never updated since the version with the new look came out with the circle unlock pad and even the app icons look different. I've always been scared that I would lose all my data such as my music and my photos. But there are too many apps out there now that requires iOS 7.0 or higher and I thought its time I update my phone as well. I asked some of my friends whether I lose or keep my data and I don't have a solid answer. So anyone who know for sure, can you please help me with this. If I have to use iCloud please tell me how I do it.

You will only lose data you choose to delete. Updating to iOS 7 will not make you lose data in less you delete it yourself.

No you wouldn't but at the same time no problem in doing a backup prior.

Generally speaking, no, but you'd better back up your iPhone first.

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