Trunk calls were commonly used in the past to refer to long-distance phone calls. However, with the advancement of technology and the emergence of cell phones, the term has become less common. Today, there are several other words that can be used to describe trunk calls, including long-distance calls, international calls, and intercity calls. Other synonyms for trunk calls include far-reaching calls, overseas calls, and distant calls. Some people may also refer to these calls as roaming calls, depending on where they are made from. Despite the different synonyms used to describe trunk calls, the concept remains the same - communication across long distances.