1. Open the "Phone" app on your iPhone.
2. Go to the "Recents" tab to view your call history.
3. Find the phone number you want to block in your call history or contacts list.
4. Tap the "i" icon next to the phone number.
5. Scroll down and tap "Block this Caller" at the bottom of the screen.
6. Confirm your decision to block the number by tapping "Block Contact."
Alternatively, you can also block a number by following these steps:
1. Go to the "Settings" app on your iPhone.
2. Scroll down and tap on "Phone."
3. Tap on "Blocked Contacts."
4. Tap on "Add New" to add the phone number you want to block from your contacts list.
5. Select the contact you want to block from your contacts list.
6. Confirm your decision to block the number by tapping "Block Contact."
Once you block a number, you will no longer receive phone calls, messages, or FaceTime calls from that number. The blocked contact will not be notified that they have been blocked.