Just some guesses or ideas… (I’m neither an expert in cellular radio technology nor do I own such a Gadgeteer module, so just take it as a starting point for further research!)
It seems that the cellular radio module basically does AT commands.
“Is there any way to send MMS using AT commands?”
–> No, according to http://www.developer.nokia.com/Community/Discussion/showthread.php?31824-Is-there-any-way-to-send-MMS-using-AT-commands
MMS needs to be transferred by an internet connection with an MMS gateway, data format is somehow similar to email. I suppose that you’ll not be able to connect to such a gateway anyway, because their data (connection details, protocol, etc.) might not be publically available.
- Use SMS. Does not support non-text data, but helpful for near-immediate notification.
- Use Internet via GPRS: You can then send any data to any server:
Email via SMTP should be possible. Use HTTP to send data to a messaging gateway, that can forward push messages to iOS or Android devices. You can even get an account for a web-based messaging gateway to send SMS or MMS via HTTP.
Maybe this is some helpful information to extend your research… If I’m plain wrong and anybody knows how to support MMS anyway: I’d be interested to know, too.