There are several synonyms for the phrase "gets someone on the horn" which means to get in touch with someone through a phone call. Some of the most commonly used synonyms include "calls someone up," "phones someone," "dials someone," "rings someone," "reaches someone," and "contacts someone." All of these phrases can be used interchangeably to convey the same idea of initiating communication through a phone call. Whether you're making a business call or calling a friend, these synonyms can add some variety to your vocabulary and make your conversations more interesting and engaging.