The customer support phone number of BancFirst is +1(405) 948-7930, 1-855-889-9216, 1-888-200-9149 (Click phone number to call). data-ad-slot=7829909793> Bancfirst Oklahoma Customer Service Phone Number BancFirst Customer Service Phone Number Phone Number of BancFirst is +1(405) 948-7930, 1-855-889-9216, 1-888-200-9149. BancFirst Corporation or BancFirst is a public financial institution, serves the residents of the United States. It is an Oklahoma state charted financial institution. It is counted among the leading financial institutions throughout the state.