Google android phones appear to be crowdsourcing countermeasures against spam calls. For instance, I have a Google nexus phone. Often, spam calls are indicate

Google android phones appear to be crowdsourcing countermeasures against spam calls. For instance, I have a Google nexus phone. Often, spam calls are indicated as such in android as I'm receiving a call. For calls that aren't indicated as spam and manage to receive my answer, I hang up and hold my finger down on the number until a menu appears where I can mark a number as spam.