Can I Use My Cingular SIM in a Go Phone?
AT&T, formerly known as Cingular, sells cell phones and cellular service plans. Consumers can choose service contracts for different numbers of minutes of monthly cell phone service. The provider tracks each customer’s usage through a SIM (subscriber identity module) in the cell phone. AT&T also provides cell phones, called Go Phones, which do not require a contract. The consumer can use the SIM issued either by Cingular or by AT&T in a Go Phone.