The same thing is happening to me with my new iPhone 4S. I can send texts through iMessage, but if I try to send either pictures or group messages via text (or someone without an iPhone) the message send fails. MMS is on. I've tried reseting all network settings, restarting the phone, logging in and out of iMessage, turning roaming on, everything.
Having the same problem. First noticed this on Friday. Checked all settings, even did a complete restore, still not able to send/receive mms messages. Looks like I'll have to call VZW.
The iPhone 4S is a device that doesn’t need an introduction! With its dual core A5 chip, all new 8MP camera, and global capabilities, this is easily the BEST iPhone EVER!!! May I ask are you getting any error messages on your phone when trying to send or receive pictures? Below is a link to assist in troubleshooting this service.
If you are still having issues with picture messaging after you have completed the steps in the link then we may have to perform a restore on your device using a computer and iTunes. If you need assistance with the restore then please reply as I am eager to help!
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I had something similiar but not quite like this. I'm using a 4s.
First, turn off imessage and see if that fixes things. If not, go to settings, general and reset all settings. After you do this you'll notice iMessage is off. My original issue was not being able to send/reply to group sms or send mms and I had iMessage on. After doing the "reset all settings" my issue was resolved.