Hi do you want to block in coming calls if so you can press the phone icon and then the dots in the top right and you should see settings if you press that a little down the page you will see the blocking option and just enter the number you wish to block
Also if you receive a call and you don't want to receive any more you can block it by pressing on it and then details and then the top right again and you will see the block option again
On the call barring I've not used it myself so I'm not sure how usefull it is but I found this by doing a search....
I tried the 0000 default passcode and I had no luck. When I dial it I am told that there was an error and check the number and dial again. What's next?