To enable spam call blocking on iPhone, you’ll turn on call blocking for Speechbolt in your iPhone settings.
1) Install Speechbolt
Make sure the Speechbolt app is installed on your iPhone.
2) Enable Call Blocking & Identification
On your iPhone, go to:
Settings → Phone → Call Blocking & Identification
Then:
Turn Speechbolt ON (the toggle should be green)
3) You’re done
Once enabled, Speechbolt can identify and block spam calls based on your settings.