Do I have an iPhone 4 or 4S?

My old iPhone 4 broke and with my insurance I got a new one. When I received the new iPhone, it was in a box which was labelled iPhone 4S. When I looked at it, it did look like an iPhone 4S as it had a black thing at the top rather than a silver bit like the iPhone 4. However, the model number is an iPhone 4 number (A133…).

So is it a 4 or 4S?

Simplest way to test this is hold the home button. If Siri pops up, its an iPhone 4S

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There are a couple of ways to tell:
- Press and hold the Home Button. If Voice Control opens, it's an iPhone 4. If Siri opens, it's an iPhone 4s.
- Open the camera app and try to take a Panorama photo (if you don't know how, look up (how to take a panorama photo in iOS 7.) This feature is NOT supported on the iPhone 4.

Do you notice this iPhone being a lot faster than your old one? If so, it's most likely a 4s because iPhone 4s is 2x faster in CPU and 7x faster in gaming. If the phone feels slow, it's an iPhone 4. If it feels decent, it's an iPhone 4s.