Hi @sinyuan98627 . 4G/5G wireless broadband uses CG-NAT which prevents the use of port forwarding.  https://www.tpg.com.au/home-wireless-broadband What is CG-NAT and how does it affect Home Wireless Broadband services? Techy types should be aware that Home Wireless Broadband uses CG-NAT. Carrier-grade NAT (Network Address Translation) is a type of network that assigns services with a private IP address, instead of a dynamic public IP address. Our network will then translate that private address into a public address. This means that the following items (which depend on internal NAT) will not work on Home Wireless Broadband: Port forwarding Hosting web, email or file servers internally Smart Home systems (e.g. accessing security camera footage remotely, home automation and printers) Remote Access (i.e. accessing your home computer or devices from another location) If you need any of these items in your home setup, Home Wireless Broadband won’t be the right fit for you.    BTW, email notification from Community is not working. You need to check back here from time to time for updates. ... View more

Hi @sinyuan98627    Aside from placing it at the window, have you tried to relocate it as well to get a good coverage? Did you notice any changes with the light status of the device?   Have you also tried to reset the modem/router?   BasilDV ... View more