Difference between iphone 3g and 3gs

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 4S	2011	A1387	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.

Identifying features

iPhone 4S

• The model number on the back cover is:
  A1387 on the iPhone 4S
• The front and back surfaces are flat and made of glass.
• There is a stainless steel band around the edges.
• The volume up and down buttons are marked with a "+" and "-" sign.
• There is micro-SIM tray on the right side that holds a micro-SIM card.

iPhone 4

• The model number on the back cover is:
  A1249 on the iPhone 4 (CDMA model)
  A1332 on the iPhone 4 (GSM model)
• The front and back surfaces are flat and made of glass.
• There is a stainless steel band around the edges.
• The volume up and down buttons are marked with a "+" and "-" sign.
• The GSM model has a micro-SIM tray on the right side that holds a micro-SIM card.
• The CDMA model does not have a SIM tray.

iPhone 3GS

• The model number on the back case is:
  A1325 on the iPhone 3GS (China)
  A1303 on the iPhone 3GS
• The back case is made of plastic.
• The imprint on the back case is the same bright and shiny silver as the Apple logo.
• The serial number is printed on the SIM tray.

iPhone 3G

• The model number on the back case is:
  A1324 on the iPhone 3G (China)
  A1241 on the iPhone 3G
• The back case is made of plastic.
• The imprint on the back of the phone is less shiny than the Apple logo above it.
• The serial number is printed on the SIM tray.

iPhone

• The model number on the back case is A1203.
• The back case is made of metal.
• The serial number is etched in the back case.

Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.