I've moved my sim from a PXT capable phone into my iPhone and now want all MMS messages to be sent automagically to PXTWorld instead of just disappearing into the ether with no notification.

When I spoke with a guy on the Vodafone iPhone helpdesk a month ago, he said this was impossible, which I find hard to believe.  Surely its a flag in a database somewhere if its related to my account, or failing that, a switch in the SIM which should be able to be reversed.

The PXTWorld help states:
If you don't have a video PXT or PXT mobile, any PXT sent to your mobile will be automatically sent here for you to retrieve. We will send a TXT to your mobile to alert you when a message has arrived in your Inbox.

I've tried submitting this question direct to Vodafone via their help pages, but the help pages break when I'm submitting my query to them, also very useful.

Does any knowledgable individual here know whether this is in fact impossible, or whether there is a way to do it, or some sort of workaround.  Even if it was a new simcard perhaps, i'm open to suggestions.

Sorry if this has already been asked, i've searched already using a variety of search terms and mostly came up blank, other than ENABLING the message delivery to the phone (Not the reverse which i'm asking)

Cheers

Jon