Should I update my iPhone 5s to ios 9?

I'll be getting a brand new iPhone 5s on Monday and it's coming with ios 8, so I was wondering if i update to ios 9 right away it won't make it slow, will it? I'll be setting it up as a new iPhone. Any advice is appreciated! 5 stars to best answer, thank you in advance!

No, it should be fine.

  • Update stopped during ios update own iphone now phones broke I connected my iPhone 4 to my computer (iTunes) and started doing the update through iTunes. About five minutes into the update iTunes in my computer stops working, causing the update to of course stop working. Now my phone will not turn on. On the screen it is black with the 'charge symbol' as if it were low on battery and an iTunes symbol. I have tried turning my phone off and on, but of course it didn't respond.
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