What language must you use for identification when using a phone emission?

Amateur radio is a global hobby, and you are entirely free to converse with other operators in any language you both understand. However, when it comes to your formal station identification on voice (phone) modes, the FCC requires that it always be spoken in English. This rule ensures that FCC monitors, official logging systems, and other operators in the United States can clearly understand and verify your call sign. Options suggesting ITU or UN recognized languages are incorrect because the FCC specifically mandates English for regulatory compliance within its jurisdiction.