We already showed you earlier on how to enable MMS and video recording on the jailbroken iPhone 3G/2G. But now with “2G/3G Video MMS Enable” app for jailbroken iPhones, you can enable video MMS functionality which is missing by default on the said models of iPhone.
Here is a simple guide to enable MMS functionality natively in the Messages app for the first-gen iPhone (aka iPhone EDGE or 2G) running iPhone firmware 3.1.2. Yes, you can now send and receive MMS messages without having to install a third party app like SwirlyMMS.