What does idd mean on a phone number? The IDD prefix is the international prefix needed to dial a call FROM the country listed TO another country. This is followed by the country code for the country you are calling (see above). The IDD situation in many countries has been changing regularly. If you are aware of more current information than that shown here, please send in a report.How do i contact ftd customer service? A professional FTD customer service representative is available to answer your questions through live chat, phone, email or GEN message.What is idt corporation? IDT Corporation is a global provider of communications and payment services. IDT is a New York Stock Exchange listed company headquartered in Newark, New Jersey, with a workforce of over 1,000 professionals on six continents.What is idds and who supports it? iDDS iDDS (i nformation D ata D istribution S ervice) is an embedded common application protocol for ”plug and play” data acquisition and control instruments. UEI supports iDDS and is a member of the iDDS Support Group along with these other industry-leading companies: iDDS support group information can be found at iddswg.org/forum/.