Yes, you can use a VPN with the Travel SIM/eSIM/Pocket WiFi. We’ve tested it on various devices, and it generally works well. However, its compatibility may vary depending on your specific device.
Since your network is using NAT, please use the NAT-T VPN server to connect via L2TP/IPsec.
**Depending on the quality of the VPN you use, the internet speed might be affected.