Can I switch my sim card in my att go phone?

i have a motorola c168i att go phone right now. but i want to buy a samsung a117. can i just put my motorola c168i sim card into a new samsung a117

Hi sure you can use your AT&T sim in samsung a117 mobile only if it is unlocked one .Else if the phone is locked to some other network provider then it wont accept AT&T sim until you unlock it .You can easily unlock your phone using sites like WickedUnlock.com they are rendering unlock code for all mobile models at reliable cost .