Why is my iPhone not sending any mms messages? - 1

I have an iPhone 3GS (I know it's an old phone). I have the prepaid pay as you go SIM card. I don't have data on it; all I have is unlimited messaging which includes mms messages. I put my SIM card in and I tested everything out. I sent messages, I called people, I connected to Wi-Fi and see if everything worked, and I also sent picture messages to see if it worked. It did. It worked perfectly fine. I could send and receive picture messages. But recently, it hasn't been working. I just updated to iOS 6 and I don't know if that has anything to do with it. I also have mms messages on in my settings. Every time I try to send a mms message, the send bar goes really slow and towards the end it stops. It will let me send mms messages on iMessage while I'm on Wi-Fi, but it won't let me send any to anyone that doesn't have iMessage, even when I'm on Wi-Fi. I have mms messaging on my plan. I don't know why it was working perfectly fine and then it stopped.

I have the SAME EXACT PROBLEM and it is driving me crazy! The only difference is I have a 4 but that shouldn't mean anything. But otherwise everything is exactly the same:/ Sorry that didn't help much but I wanted you to know you're not alone here haha

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