We use Google Chrome browser on computer to browse the web. Now a days specially designed apps, websites are available for Smartphones like Android phones. Do you know, you can open the 
Google Chrome browser in such a way that browser will show you the interface of Android mobile browser. That means, once you will open our blog or other sites or apps, you will see the layout specially designed for mobiles i.e. the same look and feel as you will get on phone. Here is the way you will have to open the same Chrome browser installed on your computer to get this interfaces.
Android interface on Chrome is available by typing the following test in the Windows Run box and hit enter. Or you can add the user-agent in “Target” box of properties window of Chrome shortcut.
[code]
C:\Users\<username>\AppData\Local\Google\Chrome\Application\chrome.exe –user-agent="Mozilla/5.0 (Linux; U; Android 2.1-update1; en-us;) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17"
[/code]
Note: Change the <username>field with the correct user name on your computer which you use to login in Windows.
I tried this and then opened few sites like Gmail, YouTube etc. on Android Interface Chrome, and here are the screenshots.
Gmail on Android Interface Chrome
YouTube on Android Interface Chrome
I tried using the user-agent for iPhone and iPad as well, but it was not working. I will update this section once will have working user-agent code for iPad and iPhone.