The MMS activation through iTunes required the phones to have an iPhone OS 3.1 update installed, a fact that some customers apparently had missed.

Some early commenters reported problems of not being able to send MMS data at all, while others noted delays in sending pictures wirelessly.

Joey Edison reported on the AT&T Facebook page that sending a picture to a coworker shortly after 4 p.m. ET and said the co-worker hadn't received it 15 minutes later. "Fifteen minutes later, really? Maybe it's because we're obsessing and taking up all the data!"

Tamim Sekander wrote at about 4:20 ET: "Working good in Dallas, but to receive one, it's like 20 minutes to get it."

Another comment from James Rosenberg in Des Moines, Iowa, at about 4:20 ET said the network was "down hard," with no ability to send pictures.