The phrase "most calling" can be replaced by a variety of synonyms, depending on the context. In terms of popularity or frequency, one might use terms like "most requested," "most in demand," or "most sought after." When referring to something that is causing the most commotion or activity, one might opt for phrases like "most buzzworthy," "most talked about," or "most intriguing." In terms of importance or relevance, synonyms like "most crucial," "most essential," or "most significant" might be used. Whatever the context, there are plenty of options to choose from when seeking out a synonym for the phrase "most calling".