GPRS costs are ~2 ct per WAP Kbyte, which means that a 100kByte MMS costs 2,08 EUR (including WAP push SMS). But 300 kByte MMS cost only 0,39 EUR! With WAP flatrates, the situation is reversed.
This is also not the usual way MMS content providers go (see http://en.wikipedia.org/wiki/Multimedia_Messaging_System for WAP Push); instead, WAP push is used: an own webserver and a HTTP SMS application is enough.
Clients should have WAP flatrates (because WAP-push delivered MMS count as WAP traffic; it is legal to use MMS over WAP push with the O2 WAP flatrate (4,95 EUR / month), because WAP pushed content is WAP content; but probably only text is viewable as the description says that file attachments are not viewable). With a WAP flatrate, it is possible to send and receive MMS with no additional costs ( http://www.telefon-treff.de/showthread.php?pagenumber=7&threadid=118603 ).
Low-cost MMS communication seems possible with a free MMS server and GPRS volume packages (if the O2 WAP flat is not allowed for this purpose; but it should: it is WAP content and the full MMS messages are viewable http://www.telefon-treff.de/showthread.php?s=&threadid=118603 )
With T-Mobile it is possible to send E-Mails as MMS to mobile phones (addresses have the form MSISDN@tmomail.net ); see http://support.t-mobile.com/knowbase/root/public/tm21396.htm?A2L.SERVICE=Pictures
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