"Got someone on the horn" is an idiomatic expression that means to have a conversation with someone over the phone. If you want to switch up your language and avoid using this phrase repeatedly, you can consider using synonyms like "got someone on the line," "connected with someone," "speaking with someone," or "in communication with someone." These phrases can help you add variety to your communication and express the same idea more creatively. Using different synonyms makes you sound more versatile and confident. So, next time you want to say, "I got someone on the horn," try using one of these alternatives.