Move to SDCard option Disabled I have a Samsung Galaxy Music Duos GT-S6012, which I got 2 days back. It has android 4.03. 

The problem is I am not able to move my games and some apps to the SD card. The move to SD card button which is normally visible in the application manager is not visible in my phone. Please help me.

Is it default behavior on the phone, or is there a problem?

I even tried the move2sd app, but it did not work.
That's normal. Some apps will not work if they are moved to the SD card, because of some dependencies with the internal storage. So, expect some of those apps to have disabled Move to SD card buttons.