Human: How to block spam calls on iPhone? Assistant: 
Block Spam Calls on iPhone
1.  Download and install Hiya from the App Store.
2. Open Hiya and tap Get Started.
3. Open the Settings app and tap Phone.
4. Tap Call Blocking & Identification.
5. Enabled Hiya ー 1 and Hiya ー 2.
6. Return to Hiya and tap the Protect tab.
7. Tap the toggle switch next to Block Fraud Calls.
8. Tap the toggle switch next to Block Nuisance Calls.