I found that generally I have to disconnect/deactivate WiFi for MMS pictures to come in.  Using ChompSMS.
If I'm connected to WiFi, I get a notification tone that an incoming text/MMS arrived, but then it will tell me it couldn't download it.
Nexus 5 running 4.4.2 stock, same behavior on StraightTalk/AT&T and now AIO Wireless/AT&T
				
			If I'm connected to WiFi, I get a notification tone that an incoming text/MMS arrived, but then it will tell me it couldn't download it.
Nexus 5 running 4.4.2 stock, same behavior on StraightTalk/AT&T and now AIO Wireless/AT&T
	