2.1.0 Varies with device
Busy call is a free emergency call managment application that based on sms. You can define sms and assign your urgent contacts in it easily. When one of the defined contact sends you an important sms, your mobile switches into emergency mode even it is muted. Assign tone for each sms code and define your own quick response message in urgent situations.
Let Busy Call to manage your important calls. It is the best way to do it.