Elderly or disabled people living alone may not be able to call for help or even push a button if they have an emergency. They die every day because nobody knows that they are hurt.
Many cannot afford a service that uses a button that they wear.
The solution is to have an ap that determines if their phone has been moved or otherwise accessed at least once every so often. The ap could be programmed to text them to see if they then respond. If not, then the ap could automatically contact via text or voice a family member, friend or 911 if nobody else could contact the elderly or disabled family member.
This kind of ap will save many lives so it would be great if a very low cost or free version was available.