How to know an iPhone 4s is not a 4 one?

So how do I know an iPhone 4s is not an iPhone 4? How do I see the differences only by using one of them?

Hold the middle buttin until siri pops up

Press the home button if Siri pops up then its 4s else its 4, the best and quickest way

The 4s has Siri, so just double tap the home button.

Or just look at the back and see if there's an S

The main difference is the siri. Long press the home button and the siri menu pops up. If not then it is iphone 4.

IPhone 4S has Siri and is obviously faster.

If Siri is switched on press and hold the Home button until the speech bubble comes up next to it. If that doesn't work, tap on the settings icon on the home screen and look for Siri in the general settings.

You can tell without even needing to turn the screen on
The cellular antenna bridges are in different places. If you look at the top of the phone and see a black line (assuming it's a black iPhone, if not look for a white line) next to the headphone socket. It's a 4.

If that black line is instead above the silent switch on the left hand side, it's a 4S.

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