The term "calling tune" refers to a specific melody or song that someone uses as their personal ringtone or notification alert on their phone. As an antonym, one could use the term "silent mode" to refer to the absence of any audible alerts or notifications. Another antonym could be "customized silence," which implies that someone has deliberately chosen to turn off all sound notifications but may still have a visual indicator or vibration to alert them of any incoming calls or texts. Additionally, "generic ringtone" could be used to describe a default, pre-installed ringtone that has not been personalized by an individual for their use.