My phone will not hold the apn settings. I can enter and save the settings, but when I leave the apn setting page and return to it, all my settings are gone, therefore I have no MMS capability. I have talked with my carrier(Straight Talk), and Sony, multiple times and have gone through the phone settings thoroughly with both. Each one seems to think it is the other's problem. I have downloaded and run Sony's PC Companion software through the phone, but that didn't fix my problem. Has anyone experienced a similar problem or have any suggestions? Thanks!