Automatic switch from Silent to Ringing Mode for important calls (free)

Ringer Mode is a simple free app which allows you to get your phone ringing when you receive a call from the person whose call you just cannot afford to miss even when the phone mode is silent. Quickly and easily toggle your phone’s ringer mode.
Have this amazing app at:
https://play.google.com/store/apps/details?id=com.creatiosoft.ringermodetrigger&feature=search_result