MMS not working

Same here, girls are getting mad at me because they're having to email me the pictures.

 

Yea I have the same problem. I can send pictures perfectly with PingChat but with regular MMS it just doesn't go through. I get a little red exclamation mark.

 

Call up AT&T and make sure everything is right on their end.
They will troubleshoot and figure it out.

 

had the exact same problem called Rogers from a different phone they kicked me rom their network and connected me back on whilst my phone was off and i could send receive messages again.

 

Usually, it's nothing to do with the 'phone - it's the network.

 

just so that we can troubleshoot the issue, is the MMS feature 'Turned On' on your phone?

Settings ->Messages

 

Also, remember that pictures taken with the iphone 4 have a higher resolution and subsequently, a much larger size. Where before you could send a 3G or 3GS photo fairly quickly, it will take longer with the 4 and possibly time out if you are not getting a strong signal.