Problem

When you use your own (non-ZOSI-provided) SIM card with the European version C291 4G camera, the camera may fail to output video or connect to the network. This is because the camera does not have the correct APN (Access Point Name) settings for your carrier's network.

This guide walks you through how to configure the APN settings on your C291 4G camera so it can work properly with third-party SIM cards.

Prerequisites

• Your C291 4G camera
• A compatible SIM card (activated)
• The ZOSI Smart APP installed on your smartphone
• The SIM card's APN information (obtained from your phone or carrier)

Step 1: Obtain Your SIM Card's APN Information

(1) Insert the SIM card into your mobile phone and check its APN settings:

Android path:

1. Open Settings
2. Tap Network & internet
3. Select Mobile network
4. Tap Access Point Names (APN)

iOS path:

1. Open Settings
2. Tap Cellular / Mobile Data
3. Select your SIM/eSIM
4. Tap Cellular Data Options → Cellular Data Network

(2) Record the following APN information from your phone:

Note: If you cannot find this information on your phone, please contact your SIM card's carrier/operator to obtain the correct APN details.

Step 2: Reset the Camera

Before changing the SIM card, you need to reset the camera:

1. In the ZOSI Smart APP, delete the camera from your device list
2. Reset the camera by pressing and holding the reset button until you hear "Reset successful, device is restarting"
3. Wait for the camera self-check to complete
4. Press and hold the power button for 3–5 seconds to turn off the camera completely

⚠️ Important: Make sure the camera is fully powered off before proceeding to Step 3!

Step 3: Insert the New SIM Card and Configure APN

(1) Insert the SIM card and power on:

• Insert your new SIM card into the camera's SIM slot
• Press and hold the power button for 3–5 seconds to turn on the camera

(2) Add the camera in the APP:

• Open the ZOSI Smart APP
• Tap the "+" button in the top-left corner
• You will enter the scanning interface — scan the QR code printed on the camera body
• When prompted, tap "No blue light on?" (since the camera has been reset)

(3) Select SIM card type:

• On the next screen, choose "Other SIM cards" (not "Standard card")

(4) Enter APN information:

• Tap "Enter the current SIM card APN information"
• A Bluetooth permission prompt will appear — tap OK to enable Bluetooth on your phone
• Allow your phone to connect to the camera's Bluetooth hotspot (broadcast by the camera's 4G module)

(5) Input the APN settings and save:

On the APN Information screen, fill in the fields you recorded in Step 1:

• APN (required) — Enter the exact APN name from your carrier
• APN Authorization Type — Select PAP, CHAP, or None as appropriate
• Username — Enter if required by your carrier (leave blank otherwise)
• Password — Enter if required by your carrier (leave blank otherwise)

After entering all the information, tap Save.

Step 4: Verify Connection

1. Wait for the camera to complete the 4G network connection (this may take 1–2 minutes)
2. The camera indicator should show a solid blue light when connected successfully
3. Return to the ZOSI Smart APP and confirm the camera appears online
4. Tap the live view to verify that the camera outputs video correctly

Troubleshooting

If you continue to experience issues after following these steps, please contact our support team with your order number, camera serial number, and carrier details.