Parents always get fraudulent calls. Is there any way to prevent the elderly from encountering telecom fraud?

Fraudulent phone calls are hard to prevent, especially for the elderly. So, I installed Zhongan's APP on my parents' mobile phone, and then bought telecom fraud insurance in it. If it is a fraudulent phone call or a fraudulent text message, Zhongan will prompt you not to answer it at first sight. If there is no reminder, you can still get compensation.