i had the hack on the carrier settings back when 3.0 came out that enabled tethering. I had that on my iphone till i updated to 3.1 and after i still had the tethering option but apparently my vvm was not working but i did have mms in the cellular data section of the settings screen but it was not active in messages. i update the carrier file to 5.1 and it added mms to the messages but im still unable to send them successfully but for some reason my vvm works again even though there is no mention of it in the cellular data section of settings. Im a little confused, so is anyone having any problems like this?