Introduction: The Dual-Camera Paradigm
In 2026, Duolingo introduced a significant security upgrade to the Duolingo English Test: the Second Camera Rule. To combat sophisticated cheating rings and desktop sharing exploits, the test now requires candidates to connect their smartphone as a secondary, lateral camera during the entire test session. This lateral feed allows the proctoring AI to monitor your hands, keyboard, desk surface, and the sides of your monitor in real-time. While highly effective at securing test integrity, this new rule has introduced a steep learning curve, with thousands of candidates receiving "Not Certified" results due to incorrect smartphone setup. In this guide, we analyze the common second camera mistakes and show you how to configure your dual-camera setup safely.
1. The Dual-Camera Geometry Matrix
To satisfy the second camera requirements, your smartphone must be positioned precisely according to these spatial parameters:
| Setup Parameter | Common Mistake | Optimal Configuration | Why it is Required |
|---|---|---|---|
| Lateral Angle | Smartphone placed directly next to the screen or behind you. | Placed at a 45-degree to 60-degree angle relative to your monitor, to the side. | Allows the proctor to see your profile, your hands, and the space behind your screen concurrently. |
| Distance & Height | Phone lying flat on the desk or placed too close to your head. | Mounted on a tripod or stand, 1 to 1.5 meters away, at shoulder height. | Ensures your entire desk surface, keyboard, and hands remain in the camera frame at all times. |
| Power & Connectivity | Relying on battery power or unstable cellular data networks. | Plugged into a charger, connected to the same high-speed Wi-Fi network. | Prevents the second camera feed from dropping due to battery drain or connection lag. |
2. Rules for Second Camera Setup
To avoid proctoring flags, follow these three smartphone configuration rules before starting your exam:
- Enable Do Not Disturb (DND): Turn on DND mode on your smartphone and block all incoming calls, messages, and app notifications. An incoming call will interrupt the camera stream, resulting in immediate test invalidation.
- Disable Auto-Lock: Adjust your phone settings to ensure the screen remains permanently on. If the screen locks or enters standby mode, the video feed will disconnect.
- Mount Securely: Do not prop your phone up against books or cups. If the phone slips or shifts position during the test, the session will be flagged as uncertified. Use a sturdy smartphone tripod.
3. Connecting the App: Step-by-Step
When launching the secure browser, you will be prompted to scan a QR code with your smartphone. This will open the official DET second camera web client. Mount your phone on its stand, scan the QR code, verify the lateral preview frame on your computer screen, and lock your phone in position before typing the first question.
4. Technical FAQ: Second Camera
Q: Can I use an old smartphone as my second camera?
A: Yes, as long as it has a working camera, a modern web browser (Safari or Chrome), and a stable Wi-Fi connection.
Q: What happens if my smartphone battery dies mid-test?
A: The test session will disconnect instantly, and you will receive a "Not Certified" status. Always keep your phone plugged into a power outlet.
Q: Does the second camera record audio?
A: The primary audio is recorded by your computer's microphone, but the second camera client may sync audio to cross-reference sound sources, so absolute environmental silence remains paramount.