Caller ID: Who Called Blocker is a free Android app developed by Quantum4u. This app falls under the Utilities & Tools category and offers a range of features to manage your calls, messages, and call logs. With Caller ID, you can easily identify unknown callers, block spam calls and telemarketers with just one tap, and manage your contacts, call logs, and call history. The app uses an intelligent aftercall screen to display caller IDs of unknown callers and comes with a true caller ID feature that allows you to identify who is calling you before receiving the call.

One of the app's most significant features is the Smart Dialer, which allows you to make phone calls directly from the Caller ID app. You can also share and delete call logs for any phone number with just one touch, block spammers, robocalls, and unwanted contacts by adding them to the call blocklist, and call, message, WhatsApp, and block any number from one page. With Caller ID, you can enjoy high-quality phone calls without any limits, thanks to its lightweight and powerful user experience. The app is entirely free to use and is an excellent choice for anyone looking to manage their calls and messages effectively.