I just bought new Nokia N9 for me, and have Straight Talk pre-paid SIM card into it! When entered my SIM card into my mobile it had the AT&T internet setting as follows:
Setting>>internet connection >> networks >> AT&T internet but I edited it to mine as “Straight Talk Internet” with APN value = att.mvno! I set the username and password for blank! After this my internet started but it status bar doesn’t show me 3G network but 2.5! Also my MMS does not work! Please help me with this MMS setting.