How to insert SIM card in iPhone 4, 3GS

Installing SIM card in iPhone is basic requirement to get going with usage of iPhone. Newer iPhone 4 has different routine to insert and install SIM card as against previous iPhone 3GS. Following is visual guide for installing SIM card in iPhone device you own. Insert SIM card in iPhone

Switch between front & back camera on iPhone

Apple iPhone 4 has two in-built cameras. One camera is located in the front above the display screen. While second camera is located at the phone back next to LED flash. Front camera is used for FaceTime feature as it has right field of view and focal length to focus on your face at arm’s