Im a new

BB user, and just got the pearl. AT&T told me prior to purchase that I would not need a data plan to SMS and MMS only a media plan. This is not true, I can SMS but no MMS. I read several places that a data plan is required for this, but I just recently read in another forum that upgrading to Mobilkom Austria [A1] 4.2.1.101 will allow me to send and receive MMS and internet would also be allowed on a pay per usage status.(which I really won't use just need SMS and MMS) If this is true does anyone know where I can download this? If it is not, does anyone know another work around similar to the TMobile enabler for AT&T.