A user buys a (brands like GL.iNet, TP-Link TL-WR902AC, or a Huawei E5573 mobile hotspot). The manual says: "Connect to the device’s Wi-Fi, then open your browser and go to http://192.168.1.100 to configure settings." The user types 19216811001 into the browser (no dots), gets a search page or an error, and posts online: "19216811001 portable not working!"
Not all portable routers use port 1001. Try: