I found the same problem today as I was looking at my bill online.  Unfortunately, it happened with a Pantech Matrix, Samsung Propel, and a Motorola Razor.  All of them have charges, that we never did.  So if this is a problem only with phones that are also capable of PDAs, then why is the Razor getting charged?  This is ridiculous.  I don't want to use the internet only messaging.  They have to be able to clear this up somehow, and block the function.  What a pain.