George wants to know if Skype can block a call from a contact list, why can't the cellphone companies? Leo says that if telemarketers are calling him on his cellphone, it's illegal to do so. He needs to demand they put him on their DoNotCall list. By law, they have to. Leo also gets around this by using Google Voice. He should let that be his permanent number and it'll deal with it. Then he can tell Google voice to only ring his phone for his contacts only. He can tell them to ignore an unknown number and block it.