If you need to block someone from calling you on your galaxy s6 edge wether its a telemarketer or just someone annoying you its pretty simple. What you need to do first is click the phone option and click the more tab on the top right. Next click the settings option on your galaxy s6 edge and you will see an option that says call rejection.
You need to click call rejection, and this will be where you can add the number you want to block on your galaxy s6 edge. There is also an option that allows you to send an automatic message to someone that your are blocking such as “im busy”, or you can just simply have your phone block the number. Keep in mind if you want to unblock someone you will need to go back to call rejection and delete the number which you blocked.