How to Chack iPhone models

Be sure you have the latest version of iTunes software. To check your iTunes version on a Mac, choose iTunes > Check for Updates. In Windows, choose Help > Check for Updates.
To ensure that your Mac or PC is compatible with your iPhone, check the system requirements for your model.

Icon	Model	Year Introduced	Model Number*	Capacity
	iPhone 5 (GSM model)	2012	A1428	16, 32, and 64 GB
	iPhone 5 (GSM and CDMA models)	2012	A1429	16, 32, and 64 GB
	iPhone 5 (CDMA China)	2012	A1442	16, 32, and 64 GB
	iPhone 4S	2011	A1387	16, 32, and 64 GB
	iPhone 4S (GSM China)	2011	A1431	16, 32, and 64 GB
	iPhone 4 (CDMA model)	2011	A1349	8, 16 and 32 GB
	iPhone 4 (GSM model)	2010	A1332	8, 16 and 32 GB
	iPhone 3GS (China)	2009	A1325	8, 16 and 32 GB
	iPhone 3GS	2009	A1303	8, 16 and 32 GB
	iPhone 3G (China)	2009	A1324	8 and 16 GB
	iPhone 3G	2008	A1241	8 and 16 GB
	iPhone	2007	A1203	4, 8, and 16 GB
* You can find the model number on the iPhone's back case.