@Deam Archer MR200 is a 4G router, not 4G+; So it can negotiate the sim card up to 4G only. Now only the Archer MR600 is a 4G+ router. The antenna is used to receive/transfer signal, to some extent,...

@akram801 What about the specific symptom of this issue? After the power off or reboot, please login to the web UI of the TD-W9960 and go to advanced-VPN page to check the status; is it still enabled...

@rsethi The Archer MR200 support OpenVPN server only, not support VPN client yet. You can ask ISP to open a port at their end for the service you have enabled on the local network, like port...

@dimvas2002 Hello, please read the same thread. https://community.tp-link.com/en/home/forum/topic/171930

@MoSalah You are welcome, glad to help you. Best regards.

@Dietmar Have you ever tried the suggestions mentioned on my last reply? Besides, please ensure that your device has connected to the TP-Link router before you enabled the guest network and save it....