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Free service TrapCall reveals caller ID information from blocked calls, unmasking numbers of blocked calls from telemarketers and prank callers with virtually no extra effort on your part.

TrapCall works like this: When you reject or miss a call, your phone forwards those calls to TrapCall’s toll free number (you have to follow TrapCall’s setup guide to do this). Once sent to TrapCall, the service works its magic on the missed call and then re-routes the call back to you, this time with the caller ID unblocked. If you reject the call a second time, it’ll go straight to your normal voicemail. On the caller’s end, all they hear during this whole process is ringing.

TrapCall offers three tiers of service. The free version does caller ID unmasking and lets you set up unwanted caller blacklists. The other two pay versions offer more features, including voicemail transcription, caller ID names, support, incoming call recording, and more. You'll need to check with your carrier to see that it supports TrapCall (and also to verify whether or not the service will cost you anything from their end—as call forwarding sometimes does).

The unmasking of blocked calls is great for people frustrated with telemarketers and prank callers, but there is a troublesome side to this service. Namely, as Wired discusses, victims of domestic violence count on caller ID blocking as a form of protection. It’s a serious outside case, to be sure, but for general use, TrapCall does what it says, and it does it well.