To block numbers on an iPhone:
Go to Settings
Tap Phone
Tap Blocked Contacts
Tap Add New
Add the numbers that you’d like to block
If you want to block a number that called you recently:
Open your Phone app
Click on Recents
Tap the i icon next to the number you want to block
Scroll down and tap Block this caller
If you want to block a number that texted you recently:
Open your Messages app
Click on the conversation with the number you want to block
At the top of the screen click on the number the text came from
Tap info
Scroll down and tap on Block this caller
Reporting spam numbers
You can report spam numbers here.