O2 just sent me a text regarding MMS...

[Markleshark]

It said

Setting up picture messaging on your iPhone doesn't seem to be working.
Give Customer Service a ring and we'll sort it out for you.

Strange, as it seems to be working fine. Maybe O2 got confused.

 

[TheMBC]

https://forums.macrumors.com/threads/711638/

 

[magga]

As of OS 3.0 GM, I no longer have the option to turn on/off MMS within the "Messages" section of settings... does anybody else also have this?

 

[TheMBC]

I think the problem comes with carrier files, the cell phone carrier decided whether MMS is available or not this time around...