If you are troubled by people anonymous calling you and you can’t get away, you can do much more than blacklisting their number. It is probably someone who know that bugs you. With today’s technology, it is easier to find who owns a mobile, landline or prepay number. There are tools and resources online that let you do this. The best I found is Phone Registry.
Not reliable. I tested my own mobile number and it said my number was a landline thru AT&T when it is actually a cell number thru T-Mobile. I definitely will not be paying for service thru phone registry.