Will factory resetting an iPhone S with an active ATT SIM card affect the SIM card at all?

Will factory resetting an iPhone S with an active ATT SIM card affect the SIM card at all?

It will not affect the SIM. Do make sure you have your stuff backed up.

Not sure what model that is

Not at all. The SIM card doesn't have anything to do with the data on your phone. However, make sure you have your important data backed up (cloud or iTunes) because everything will be erased.

No it should not harm the SIM card in the least