The APP is designed specifically for use with devices such as wireless router mainly such as MiFi, CPE, etc. for personal or home use. If you do not have such devices , this APP is not suitable for you. The APP can be utilized to connect to devices such as routers for making voice calls. Features include: The APP can bind and unbind your personal wireless router product through wifi connection. When the binding is successful, the wireless router becomes a wireless router that can talk. The APP provides the ability to make calls through your wireless router, and the cost of the call will actually come from the SIM card on your wireless router. There is no additional charge for the phone. You'll actually have one more phone number than your original cell phone The APP provides the ability to receive calls from outside the wireless router, but even when your phone is not connected to the wireless router, the phone can receive incoming calls and access the router's communication history.