AT&T US customers now have MMS on iPhone. Install iPhone OS 3.1, then update your AT&T carrier to v5.5 by clicking on your phone in iTunes and going to “Check for Update.” Then enable MMS, go to Settings -> Messages. You should see an option to turn MMS on. Now, whenever you’re sending a text message, you’ll see a camera icon in the lower left corner, you can tap to attach a photo. On original iPhone, MMS cannot be natively sent or received. However, AT&T’s Viewmymessage.com service send a standard text message with a link to view on non-MMS, but Web-enabled, phones. Apple warns MMS over Wi-Fi is not supported, so slower EDGE or GPRS connection, will have to wait for MMS to be sent. However, Apple says you can still send pictures through Mail over Wi-Fi as a workaround to slower connections or poor coverage.