Blocking unwanted incoming calls
Blocking unwanted incoming calls is a free service and it allows you to block certain incoming calls, including anonymous numbers.
It also gives you the opportunity to create a list with numbers that are allowed to call you. In this case, any other number from outside of the list won't be able to call you.
To block the unwanted incoming calls, all you need to do is to sign in to your account and choose "Phone numbers" from the menu. Then go to "Settings" and click on the link "Blocking unwanted incoming calls" to activate the service. Finally, on the new website, mark the type of the call block, enter the phone numbers you want to block and/or select the option "add all the anonymous numbers".