If I update my iPhone will it unjailbreak it without any problems?

I'm having to use my sisters old iPhone (4s) and it needs to be updated so that I can get on instagram and other apps successfully. If I update it will it mess it up? Do I have to have a computer? Also let me note that it doesn't matter if I lose anything (or everything)

Ok I know when you update an Ipod with iTunes, you have to lose everything. Now you can update in the appstore. It should be fine though.

If you update a jailbroken iPhone, it will remove the jailbreak without any problems if you have the latest version of iTunes.

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