How to Block a Number on iPhone
Step 1. Unlock your iPhone and look for your ‘Phone’ application. The green coloured icon should be in your taskbar by default. Click on this icon.
Step 2. Here, in the running menu at the bottom of the page, click on Recents. This method will work for unsaved numbers as well because they don’t show up in the contact list otherwise.
Step 3. You will see your recent call list. In this list, look for the number you want to block. Once you have found it, click on the ‘i’ button next to it on the right.
Step 4. You will be taken to a screen showing more information and options regarding the contact or the unsaved number.
Step 5. Scroll down this screen. At the bottom, you will see the option to ‘Block this Caller’. Click on it.
Step 6. In the confirmation options that your iPhone shows you, select ‘Block’. This will effectively block the selected number. You will no longer receive calls from the blocked number.