In your E90 there is a software, Bar Code, which can scan the codes. Now you can create your own code by Nokia Mobile Codes. It is sometime can be used for fun or something useful. You can create a web address, email address, text or phone number to dial into codes. These codes read by Bar Code application built in on your E90. For others ESeries may download other Code Reader.
Here is the examples, just scan these picture below by your Bar Code from your E90
Source: Macammacam.info