Nize - Spam Blocker. Caller ID is a free, easy-to-use scam shield & spam call blocker, which enables you to learn who’s calling you, identify fraud calls, stop spam calls, filter calls from your blacklist, etc. Features: Identify phone ID, even when you’re being called from a private number Trap spam call with the smart scam shield Blacklist unwanted calls within the spam call blocker Block unknown callers Do phone lookup anytime, even when you’re offline The app is equipped with robust pho