How do i contact ems in the us? (+1 800) 222 1811. The EMS service in the United States of America is Priority Mail Express International, part of the United States Postal Service which is the United States of America's designated universal postal service provider, supporting customers, businesses and communities worldwide.What is the ems service? The EMS service in the United States of America is Priority Mail Express International, part of the United States Postal Service which is the United States of America's designated universal postal service provider, supporting customers, businesses and communities worldwide.How do i find my ems package? EMS Customer Support If you have a problem finding your package, please get in touch with your local EMS customer service or call centre who can answer general EMS queries, find your tracking number and help you locate your EMS item. Use the search function or alphabet to find your local operator faster.What are emsems products and services? EMS products and services include: Visa, MasterCard, Discover and American Express payment processing. Payment Gateway. High-Risk Merchant Accounts. Voyager and EBT. ATM and Debit. Virtual Merchant. Check Guarantee & Electronic Check Conversion.