How do I block unknown calls and text messages?

[AC Question]

Block unknown calls and txs

How can I only receive calls and txs from people in my contacts

 

[ShinyPixelgames]

Re: Block unknown calls and txs

What mobile are you using?

I'm using an OPO, and I believe that I don't have that option, I can only block certain numbers as far as I know. But I know people who are able to block non-added numbers.