Exhibit 21.1 Applied Cellular Technology, Inc. List of Subsidiary Companies Company Name Country or State of Incorporation - ------------------------------------------------- ------------------- ACT Acquisition Corp. Delaware ACT Automotive Group, Inc. Delaware ACT Communications, Inc. Delaware ACT Financial Corporation Delaware ACT-GFX Canada, Inc. Ontario, Canada ACT Houston Leasing Corp. Texas ACT Leasing Corp. Delaware ACT Louisiana Leasing, Inc. Louisiana Advanced Telecomm of Maryland, Inc. Maryland Advanced Telecomm of Pittsburgh, a Pennsylvania Business Trust Pennsylvania Advanced Telecommunications, Inc. Illinois Alacrity Systems, Inc. New Jersey The Americom Group, Inc. Louisiana Applied Cellular Technology Financial Corp. New Hampshire Applied Cellular Technology International, Ltd. United Kingdom Applied Cellular Technology of Missouri, Inc. Missouri Atlantic Systems, Inc. New Jersey Aurora Electric, Inc. Alaska Blue Star Electronics, Inc. New Jersey Canadian Network Services, Inc. Delaware City Dial Network Services, Ltd. Ontario, Canada Consolidated Micro Components, Inc. Pennsylvania Cra-Tek Company California C.T. Specialists, Inc. California Cybertech Station, Inc. Pennsylvania Data Path Technologies, Inc. New York Delaware Tele-Resources, Inc. Ontario, Canada Elite Computer Services, Inc. New Jersey The Fromehill Company Utah GDB Software Services, Inc. New York Ground Effects Ltd. Ontario, Canada Hopper Manufacturing Co., Inc. California Information Products Center, Inc. New Jersey Innovative Vacuum Solutions, Inc. Pennsylvania Inteletek, Inc. Delaware MVAK Technologies, Inc. New Jersey Norcom Resources, Inc. Minnesota Pizarro Re-Marketing, Inc. Texas PPL, Ltd. New York Service Transport Company New Jersey Signal Processors Limited United Kingdom Signature Industries Limited United Kingdom STC Netcom, Inc. California Company Name Country or State of Incorporation - ------------------------------------------------- ------------------- Teledata Concepts, Inc. Florida TigerTel Services Limited Ontario Universal Commodities Corp. New Jersey US Electrical Products Corp. New Jersey Winward Electric Service, Inc. Utah 2