I upgraded my straight talk phone about two months ago from a basic smart phone to a galaxy s3. I cant send or receive MMS messages on the new phone. I have read forums online on how to fix the problem and they all basically lead me to the APN settings. I have even watched YouTube videos on how to get to the exact place in my settings. Well when I go to my wireless settings there isn't an option for APN, I only have the option for mobile data being on or off. I have tried restoring my phone to factory setting, no luck. One forum said that sometimes when upgrading your phone you have to wait a month or so because of the switch... Well that's passed and still nothing. I am wondering if it has anything to do with my Sim card? This is my second galaxy s3, my first one was a total POS and I had to send it back and get this new one. With my first one I didn't insert my Sim card and it sent messages fine. This one I did insert it thinking that's why I had problems with the first one, but now MMS messaging doesn't work. Please somebody help!