If you don't want to receive calls or texts from a certain number, you can block it. When the number tries to contact you, your phone will automatically decline the call or text.
You can still call or text a number you've blocked. But, you'll see Blocked on the listing in the Phone app and will get a warning in the Messages app, because you won't receive a response or a return call unless you unblock the number.
Use either app to block both calls and texts from a number.



Tap 
Or, touch 
Use either app to unblock a number, so you can receive calls and texts from that number.





If a contact has multiple numbers, you can block them all with the 

On the contact screen, you'll see 




Your phone will block calls from private or unidentified numbers. You'll still receive calls from phone numbers that are stored in your contacts.