According to a UK report, about one-third of all persons with dementia live in their own homes alone [13]. The proportion increases year by year; it is estimated that between 2008 and 2033 the percentage of people with dementia, aged 75 to 84, who live alone will increase to 38%. Figuring out how to support that group of people to enable them to live independently in a safe and healthy manner is a critical challenge to our society and, as researchers, is our goal as well. The proposed system, hopefully, can assist elderly individuals to reduce the potential risks of engaging in some outdoor activities, such as taking a walk or going shopping. The findings of this study provide useful information for comprehending the operation and effect of a mobile phone monitoring system in an aging society.