I have a samsung blackjack and my mms is not working it says unable to connect. verify your profile settings or try again. I cannot get on AIM either. if you go on this website... http://www.wireless.att.com/support/deviceConfig.do?content=KB72307.html and if you go on number 11. to advanced settings. my everything has att. but on the website it has cingular. idk if dat has to do with anything so please help me out. thanks!