11-07-2011 07:38 AM
Hello moefallatah and welcome to the BlackBerry Support Community Forums.
Language packages are carrier determined for availability.
That being said, you can go to the Applications on your Desktop Software and to Add/Remove applications to see the list of available languages for installation.
If you do need see Arabic as an available option you will want to contact your mobile network carrier for further assistance with this.
Hope this helps.