EV-DO (Evolution Data Optimized) or 1xEV-DO : A wireless radio broadband data standard adopted by many CDMA mobile-phone service providers in Japan, Korea, Brazil, Israel, the United States, Australia, Canada, New Zealand, Venezuela and Mexico. It was originally developed by Qualcomm and was standardized by 3GPP as part of the CDMA2000 family of standards. In the U.S., Verizon Wireless and Sprint have completed significant deployments of 1xEV-DO. Alltel has also deployed EV-DO to a few markets as of January 2006. EV-DO roaming between carriers is currently not available in North America.