U.S. mobile phone carriers recently announced various combinations of exchanging MMS (multimedia) messages. But, looking at the separate announcements was confusing to me. So, I drew a little diagram to help me figure out which services can exchange MMS messages.
The diagram on the left is based on information from the CNET News.com article:
Note that the MMS exchanges are point to point.
So, you could not, for example, send an MMS message from a Verizon Wireless phone to a T-Mobile phone using Cingular as an intermediary (if I interpreted the news articles correctly).
Are you going to start sending MMS messages to friends on other networks now?