any latest Samsung has this features.

After receiving calls go to options add to reject list.
The call will register to your phone but will just be busy tone to the other caller all the time they try to call you.

After receiving text go to options Add to block list.
The details will be sent to you that the person had sent you a message but no messages inside it because they are block as an incoming messages.
You will never have any annoying caller anymore.

And yes it does work there in Qatar.