What's the best Android app for identifying unknown callers and messaging them without saving contacts?

Eyecon Caller ID & Spam Block is designed specifically for users who receive frequent calls from unknown numbers and want to both identify callers and communicate with them efficiently. The app's caller identification system displays names and profile pictures for incoming calls, even when the number isn't stored in contacts. This proves particularly useful for business calls, delivery services, or new acquaintances. The WhatsApp integration stands out as a practical feature—users can message unidentified numbers directly through WhatsApp without first saving them to their address book. Reviews indicate this workflow saves significant time for people who frequently communicate with temporary contacts like service providers or marketplace buyers. The spam blocking component automatically filters suspected telemarketing calls and scam attempts. Some users note that the caller database occasionally shows outdated information for recently changed numbers, though updates typically resolve this. The interface remains straightforward with large contact photos and clear identification labels during incoming calls. For small business owners or frequent online marketplace users, these features streamline communication while maintaining privacy boundaries.