If you keep accidentally butt-dialing your iPhone's emergency contacts, you can quickly put a stop to that by turning off that Auto Call feature. Here’s How!
How to disable iOS 11 Emergency SOS Auto Call
Just follow these 3 steps:
1. Open your iPhone Settings.
2. Scroll down and tap Emergency SOS.
3. Toggle the Auto Call switch to the off position. Gray means off.
That's it. You can still hold the power button and a volume key to trigger Emergency SOS, but unless you move the on-screen slider from left to right, you won't accidentally call anyone.