One of the great features in iOS 10 is the ability of Siri to work with some Apps. Remember, this is not for all Apps, but only the Apps that support Siri. As an example, you can ask Siri to send a WhatsApp message to a certain person or group.
To start using this feature, first you need to approve the Apps to use it with Siri. You might be surprised to see that there are number of Apps that support Siri. The number of Apps also depend on the Apps installed in your device.
Turn on Siri for supported Apps in iOS 10
- Open Settings
- Open Siri
- Click the last option Application Support
- Enable the App that you want to use with Siri
You can see all the Apps that support Siri in this window.