How to Scan QR code or barcode using Smartphone

How to read QR code or barcode using smartphone Android or iOS (iphone)?.
Have you ever bought a product and it said for the more manual information and for the software you have to scan the QR Code. How to do it?

Example QR Code for h0w2.blogspot.com

• First you have to have the App named QRcode reader/scanner in you Smartphone.
• Go to Android Google Play or App Store for iOS.
• Search App with keyword: QR code reader or QR code scanner
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