rLookup is a free reverse phone lookup app that helps you quickly identify the owner of any phone number.
Wios released rLookup app to allow users find out who is calling them. With growing number of scam callers, users are hesistant about answering the calls. With rLookup, they can know who rang their phone before answering the call. This mitigates the risk of answering a scammer's call or ignoring an important call.
You can now set rLookup as your default spam blocker and Caller ID app on Android. This allows rLookup to automatically block known spam callers. For incoming calls from numbers not in your contact list, the app will also display Caller ID information for free.
For web-based reverse phone lookup, you can use Valid Number.