MMS settings htc surround. I have Straight Talk service on AT&T GSM. Everything is working on the phone since I changed the APN settings, except MMS. The fields for MMSC and MCC are not visible in settings. The following link speaks of an HTC connection manager which will make them visible and edittable, but I cannot find it anywhere. http://www.windowscentral.com/windows-phone-7... Does anyone have any advice or possibly the file I need?