... systems (COS). ChipCity products are applied in Telecommunication, Banking, Finance, Taxation, Pay-TV, Public Security projects and other fields. ... Card Operating Systems (COS) are for (U) SIM cards, Banking, Finance (EMV, USB keys, Mobile Banking, Mobile Pay & NFC), Taxation ... to contact us for any help about smart card! ChipCity information is here:Beijing ChipCity Technology Co., Ltd.3-1313, ...