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By Phone

24 hours a day, 7 days a week, 365 days a year

United States or Canada call 1-888-853-3503 (toll-free)

  • Country
    Toll Free Dial
  • China Netcom 00-800-1151-5001
  • China Telcom 00-800-1151-5001
  • Denmark 00-800-1151-5001
  • France 00-800-1151-5001
  • Germany 00-800-1151-5001
  • India 000-800-100-4018
  • Japan IDC 061-800-1151-5001
  • Japan KDD 010-800-1151-5001
  • Taiwan 00801-14-8899
  • United Kingdom BT 00-800-1151-5001
  • United Kingdom CW 00-800-1151-5001
  • All Other Countries +1-415-352-2178

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By Mail

Comm 2000
151 Eastern Avenue
Bensenville, IL 60106

By Fax

Toll-free from the United States and Canada, dial 1-888-UL33512 or 1-888-853-3512

Toll-free from the countries listed above, dial Country Code +1-888-853-3512

All other Countries, dial +1-630-274-6338

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