Thanks for sharing.

The SIM card slot still fail off. This is bad. We optimized once and it should be OK.

It is using a microSD card so pls use the correct SIM size.

Its power consumption is big so 12V make it stable. As it is not designed for travel so we didn’t use 5V.

If you travel to China this may be a problem. Most of the time openvpn does not work because of the firewall. You may bring a roaming SIM card which by pass the firewall automatically in case your vpn does not work.