Q: Hi, the calendar of my iphone 6 freezes, how can I make sure it works properly?

Hello matclav,

Thank you for using Apple Support Communities. 

I see that your Calendar app on your iPhone is freezing. Have you tried the following steps: 

Restart the app

Close the app and open it again.

Restart your device

Turn your device off and back on.

Check for iOS and app updates

1. Make sure that you're using latest version of iOS.
2. Open the App Store and tap Updates.
3. If updates are available, tap Update All.
4. If asked, enter your Apple ID password. 

You might need a Wi-Fi connection to update some apps.

These steps are from the following support article:

If an app you installed unexpectedly quits, stops responding, or won’t open

If it is still not working, let us know and we can see what we would need to look at next. 

Best regards.