Here are the best APN and MMS settings for the Windows Phone 8 if you wish to use it on the AT&T network. windows phone 8 pin stuff APN: wap.cingular USER NAME: [email protected] PASSWORD: WAP GATEWAY(URL):wireless.cingular.com WAP GATEWAY PORT: 80 MMSC(URL); http//mmsc.cingular.com/ MMSC PORT: 80 MAXIMUM MMS SIZE: INTERNET APN APN: wap.cingular USER NAME: [email protected] PASSSWORD: PROXY SERVER(URL): PROXY PORT: