# VPN Service
> For the complete documentation index, see [llms.txt](https://help.1nce.com/llms.txt).
Each 1NCE SIM has a private IP and is connected via the Internet Breakout using Network Address Translation to the open internet. By default the connection establishment is unidirectional from the SIM device to a server/service in the internet. The 1NCE VPN Service enables 1NCE customers to connect and transmit data bidirectional with their SIM devices via a Virtual Private Network (VPN) connection.
This section covers the setup of the 1NCE VPN client for Windows, Linux and Mac OS to establish a connection with the 1NCE Network Service. For custom OpenVPN installs, advanced routing or specific application setups refer to the OpenVPN Documentation.
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# Setup Guides
For a detailed guide on how to install the VPN Client click on one of the following Operating Systems:
