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How can you tell if it's an iPhone 4 or an iPhone 4S?

I think the iPhone 4 and iPhone 4S look identical from the outside, is that right?
So how can you tell if it's an iPhone 4 or an iPhone 4S? I ask because I was thinking of buying a second-hand iPhone 4S :D

Most Useful Answer JanSt  Apr. 24, 2013 at 16:29

- The iPhone 4S has a model number of: A1387 while the iPhone 4 has a model number of: A1332
- The iPhone 4S has 4 antenna breaks while the iPhone 4 GSM Model has 3.
- So the iPhone 4S MUST NOT have a antenna break on top of the phone and MUST have a antenna break above the vibrate switch and on the top right side of the phone.
http://forums.macrumors.com/showthread.php?t=1254848

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JanSt / MOD  Apr. 24, 2013 at 16:29

- The iPhone 4S has a model number of: A1387 while the iPhone 4 has a model number of: A1332
- The iPhone 4S has 4 antenna breaks while the iPhone 4 GSM Model has 3.
- So the iPhone 4S MUST NOT have a antenna break on top of the phone and MUST have a antenna break above the vibrate switch and on the top right side of the phone.
http://forums.macrumors.com/showthread.php?t=1254848

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