How to Use Device Network (VPN)

Device Network sends an Android phone’s traffic to the computer over USB, then out through the computer network or a saved proxy or VPN route. Each phone can use its own route with live traffic statistics.

Full video: add a route, test its exit, assign a device, and verify the public IP
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Before you start

  • A LaiCai Screen Mirroring Premium membership
  • An Android phone connected over USB
  • A Device Network-capable LaiCai Android Agent installed on the phone

Where phone traffic goes

The phone stops using its original Wi-Fi or mobile data. Requests and responses travel through the same USB path and the selected computer-side route.

Android phone
USB
Computer
Selected route
Internet

Available route modes

Open Devices → Device Network, switch to Routes, and click Add route.

Computer network

Use the computer’s current connection; start here to verify Device Network.

SOCKS5

Enter the proxy host, port, and optional username and password.

HTTP

Use an HTTP proxy. TCP and DNS are supported; other UDP traffic is unavailable.

HTTPS

Use an encrypted HTTPS proxy. TCP and DNS are supported; other UDP traffic is unavailable.

WireGuard

Import a WireGuard .conf profile.

OpenVPN

Import an .ovpn profile and add credentials only when required.

Add and connect a route

1

Add a route

Under Routes, click Add route, name it, and choose a mode. Computer network needs no extra configuration; OpenVPN and WireGuard require a matching profile.

2

Test the route

Save and click Test. A successful result shows the exit IP, elapsed time, and timestamp. The test does not start the phone VPN or change the computer’s system route.

3

Assign it to a device

Open Device connections, select an online phone, and choose the saved route. LaiCai remembers the assignment, but it does not reconnect automatically after the app restarts.

4

Connect and verify

Click Connect and accept the Android VPN request the first time. Check the phone’s public IP; it should match the route test, while the device row shows inbound and outbound traffic.

Disconnect and restore networking

  • The VPN key in the Android status bar means Device Network is handling phone traffic.
  • “USB tunnel active” confirms only the USB channel, not public internet reachability.
  • If USB or the route drops while the phone VPN remains active, traffic stays blocked instead of falling back to the phone’s original network.
  • When finished, click Disconnect or choose Stop and restore phone network in Agent.
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