You can't. A VPN (Virtual Private Network) requires an active internet connection to function, regardless of whether that connection is Wi-Fi or cellular data.
Here's why:
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VPNs need an existing connection: A VPN works by encrypting your internet traffic and routing it through a VPN server before it reaches its destination. This process requires an underlying internet connection to establish the secure tunnel. Without an internet connection (Wi-Fi or cellular data), there's no traffic to encrypt or route.
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Think of it like a detour: Imagine you want to take a detour to avoid traffic. You still need a road to start on before you can take the detour. Wi-Fi or cellular data provides that initial "road" (internet connection) that allows the VPN to function as the "detour."
In summary, a VPN enhances your internet security and privacy by creating a secure connection on top of an existing internet connection. It doesn't provide the internet connection itself.