STEP 5: Whenever you need to scan a QR Code on your iPhone, simply launch that app and tap on Scan button at the bottom of Settings screen, position your camera such that it points the QR code and let it read it. That is it! This is how you can scan QR codes on iPhone.Related posts:ach smartphone app has it very own QR Code which can be read and scanned only by QR code scanners. Here is the step by step procedure to scan QR codes on iPhone: STEP 1: Go to your iPhone Springboard and tap on the App Store to launch it. STEP 2: There, tap on the Search button and type NeoReader.