I have a choice to upgrade my phone.iPhone 5 or 5S?

Should I wait for the iPhone 5S which I heard was completely physically the same as a 5 but the hardware was changed and now are new features like the fingerprint sensor. I'm not sure what I should get

You'll have to wait until the 5S is available to know for sure, because until then, nobody knows exactly what features it will have and how much better it will be than the 5.

One thing is pretty likely though - when the 5S (or whatever it is) does come out, the 5 will cost less, and maybe the extra price of the 5S won't make its extra features worthwhile (that's kind of how it was with the iPhone 5 vs 4S).

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