QR codes for smartphones are efficient way to create instant links to your website. Your visitors can scan the code with any smartphone or tablet equipped with a camera (iOS, Android and BlackBerry). QR code generators and scanner apps are usually free to download (QuickMark, Nokia Reader, BeeTagg, KAYWA Reader, pCode, i-nigma Reader, Lynkee Reader, NeoReader, ScanLife, MobileTag).
You can use QR codes to navigate to the link using a free built-in App:
Apple phone: open your camera App and point to a QR code to open the link in Safari browser.
Android phone: open the Browser App, go to Setting, Select the "Scan QR Code" option to open the link in Internet browser.