If you want to root your Android phone and don't know how to do it, or thinks it's messy to do, then I Highly recommend Framaroot - it's a "one-click-to-root" app that you can install for free! I just installed it and rooted my Samsung Galaxy S3 4G with it :) Worked great and took 3 seconds :)
Download the framaroot android app from the source link below and install it on your phone.
Here an one-click application to install Superuser and su binary on phone. Look at the compatibility lists below to see if this application can be useful for you.Source: [ROOT] Framaroot, a one-click apk to root some devices - xda-developers
Feedbacks on compatibility devices will be greatly appreciated in order to update the compatibility list.
Superuser and su binary include in application work from android 2 to 4.