I have an iPhone 3GS that I am using on straight talk. I started with them a week and a half ago and had problems with picture messaging. Now I am having a problem and when I click on the Green Message icon the phone looks like it is going to the familiar white screen where all of the text messages are shown, but then in a few seconds it goes back to the home screen. If someone sends me a message the preview shows up on my phone home screen but if I click the Green icon I can not get to the list of messages. The APN and MMS settings are correct according to what I have researched. Any suggestions will be appreciated. I have no problems with accessing data or with making or receiving phone calls but the text issue is driving me CRAZY..PLEASE HELP