Motorola Mobility A1200 "missed calls att phone" Questions

calls but can't receive them I am not sure which carrier you use, but I used to work for Cingular (not ATT) where we had the same problem with a lot of the Motorola phones. Even though we were told to

...calls me and doesn't leave a message, I have no idea who called. It will tell me I missed a call but when I go into the call log there is nothing. I think the setting that needs to be changed has ...

...missed a call but when I go into the call log there is nothing there. Do you know what the problem is and what setting I need to change? View free space by choosing OPTIONS - STATUS, & look at FILE ...

att/cingular and the my sx66 is locked to cingular. When I insert my sim(3g by the way) and power the phone it goes through set up fine, but when it gets to the home/dialer screen, it says "invalid or