Checking Your Phone
1.Open the Settings.
You can tap the Settings icon on your Home screen, or press the phone's Menu button and select "Settings".
2.Scroll to the bottom of the list and select "About phone/About device".
If your Settings menu…
Look at the back of your iPhone and locate your Model number.You can find your iPhone model number by looking at the small text on the back of the iPhone.There should be something that says "Model AXXXX".