When only the iPhone turn on Airplane Mode, Apple Watch isn't. I can't use Apple Watch to make calls. Is my watch error?

Greetings Nhi_Mizys,

If you have your Apple Watch set to mirror your iPhone settings, this would be expected behavior.

Use Airplane Mode on your iPhone, iPad, iPod touch, and Apple Watch - Apple Support

"You can set your iPhone and Apple Watch to mirror the Airplane Mode setting of the other device. Go to the Watch app on your iPhone, then tap General > Airplane Mode > Mirror iPhone."

Take care.

Greetings Nhi_Mizys,

Have you updated your Apple Watch and iPhone to the latest versions of software? This can help resolve these types of issues. To complete this, follow the steps below:

1. "Make sure that your watch is connected to Wi-Fi.
2. On your watch, open the Settings app.
3. Tap General > Software Update.
4. Tap Install if a software update is available, then follow the onscreen instructions.

Leave your Apple Watch on its charger while the update completes, and don't restart your Apple Watch. When the update completes, your Apple Watch restarts on its own."

Update your Apple Watch - Apple Support

1. "Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.

5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do."

Update your iPhone or iPad - Apple Support

If additional assistance is needed after those steps, reach out to Apple Support.

Take care.

Hi Nhi_Mizys,

It sounds like you may want to have this father investigated if this is not working as you would expect. We recommend connecting with Apple Support so they can see what can be done based on being unable to make calls when not mirroring the device in AirPlane Mode.

Thanks for using Apple Support Communities.