Abstract: A user device (e.g., a mobile phone) may receive unwanted calls on a regular enough basis to irritate a user of the user device. Systems and/or methods, described herein, may identify unwanted calls in an automated fashion, and may allow users to quickly make intelligent decisions as to whether they should answer an incoming call from an unknown number or not. Potentially unwanted calls may be blocked entirely, to further enhance users' experiences. The determination of whether a caller is an unwanted caller may be refined in an ongoing process, in order to ensure that calls are being properly blocked or allowed.