Prevent Siri from making a phone call.

Yeah my Siri makes calls all the time I try to say Siri cancel call as fast as possible. It seems to get really confused if I speaking a different language in the same room with my phone. I mean it also changes me to different keyboards several times a day, French, English, Spanish in rotation. It never knows what’s going on.

Accidental touches or movements when the screen is unlocked can indeed lead to unintended actions, including making calls. To minimize this risk:

1. Set a shorter auto-lock duration for your screen. This can be found in Settings > Display & Brightness > Auto-Lock. A shorter auto-lock time will reduce the chances of accidental actions when the phone is left unlocked.
2. Consider using a cover or case for your iPhone that covers the screen when not in use. This physical barrier can prevent accidental touches or movements from initiating actions.

Accessibility Settings

Go to Settings > Accessibility > Touch, then tap Haptic Touch or 3D & Haptic Touch. Choose the touch duration—Fast or Slow. On an iPhone with 3D Touch, you can also choose the pressure needed—Light, Medium, or Firm. Test your new settings on the image at the bottom of the screen.

Adjust how iPhone responds to your touch - Apple Support (IN)

It sounds like there might be some confusion in the voice commands given to Siri on your iPhone. Sometimes, Siri might misinterpret or mishear commands, especially if there's ambiguity in the language or phrasing used.

If Siri is mistakenly interpreting HomeKit commands as call commands, you can try being more specific and precise when giving voice commands related to HomeKit devices. For example, instead of saying something that might sound similar to a call command, try using clear and distinct phrases like "Turn on [specific device name]" or "Set the temperature to [desired temperature] in [room name]."