Orange is a telecommunications operator, headquartered in France, and is one of the world's leading telecommunications operators and a leading global provider of IT and telecommunications services. Orange certification refers to the operator test certification as defined by Orange.
Vodafone is primarily concerned with performance testing, which requires additional testing to be done by the manufacturer in an authorized laboratory including antenna performance, audio performance, and SAR. Vodafone's authorized laboratories are called "Qualified laboratories".
Founded on June 30, 2000, Verizon Communications Inc. is the world's leading provider of technology, communications, information, and entertainment products and services.
AT&T is a U.S. based multinational conglomerate holding company and the nation's largest provider of fixed-line and mobile telecommunications services.
T-Mobile USA (English: T-Mobile US, Inc., commonly referred to as T-Mobile) is an American wireless network operator headquartered in Bellevue, Washington.
KDDI is a large Japanese telecommunications company, which was formed on October 1, 2000 by the merger of DDI, KDD, and IDO, and its market share ranks second in the Japanese market.
