Can OOREDOO sim card work on your smart phone? After you insert the sim card into the router, does it recongnised? If it doesn't recongnise, you can try to put APN and dial number manually.

I consulted tp-link support before and we can set the DHCP range with new release soon.

If you want to use Deco along with your existing router, do the following: Define a different network name (SSID) and password from those of your current network. Running Deco with the same SSID...

Do you use the latest FW? When you lost connection, how can you get them reconnected? restart? Try to unplug all the RE units to see whether it will lose connection frequently. For your case, it's...

Generally speaking, we can use the wan ip:port number to access the camera remotely after you open port for it. In your case, you may try the DMZ for your camera to see whether it can be accessed. If...

The USB connection only supports windows PC or other devices.