How to Tell an iPhone 4 from a 4s

Step-by-Step Guide

1. 1

   Step 1: Check the front and back exterior.

   The iPhone 4 and iPhone 4s both have a flat front and back made of glass, and both have a stainless steel band around the edges.
2. 2

   Step 2: Notice the Volume buttons.

   Both iPhones have Volume buttons marked with a plus (+) and minus (-) sign. , There are 2 models of the iPhone 4:
   GSM and CDMA.
   
   CDMA has no SIM tray, but the GSM has one for a micro-SIM card.
   
   There are 3 models of the iPhone 4s:
   GSM, GSM model China, and CDMA.
   
   All models have SIM trays for micro-SIM cards. , The iPhone 4 has the following model numbers:
   A1332 for GSM models and A1349 for CDMA models.
   
   The iPhone 4s has these model numbers:
   A1431 for GSM model China, and A1387 for CDMA models and GSM models.
   
   You can see these model numbers at the back of the iPhone. , Depending on the model, your iPhone will have a slightly different pattern of antenna breaks, or small notches in the iPhone's silver side band.
   
   The iPhone 4 (GSM) has three antenna "breaks" in the metal band (one on the top and one on each side toward the bottom).
   
   The iPhone 4 (CDMA) and iPhone 4S have four (two on both sides toward the top and bottom).
3. 3

   Step 3: Check the SIM tray.

4. 4

   Step 4: Know the model number.

5. 5

   Step 5: Identify the differences in antenna breaks.

Detailed Guide

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