MMS Delivery Restrictions on Vodafone?

Hi there - Hope I've posted this in the right spot.

I'm currently working on a project where we need to delivery mms messages to a small group of our customers. I wondering if anyone knows about any current mms delivery restrictions set up by the 3G networks, especially around size?

I searched the forums and found an old post from 2005. Does anyone have any updated information?

Many thanks,