| CPC H04L 63/14 (2013.01) [H04W 8/20 (2013.01)] | 29 Claims |

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1. A method of computing a contactability metric of a subscriber identifier, comprising:
obtaining, via a communications network coupled to a client computing resource, signals indicative of the subscriber identifier;
computing the contactability metric of a communications device corresponding to the subscriber identifier, the contactability metric to relate to a likelihood that the communications device can be electronically contacted within a predetermined interval, the contactability metric being computed responsive to one or more signals from one or more databases accessible to an authenticator, the one or more signals being indicative of a presence of one or more of the following signals obtained in response to:
determining a type of the communications device;
determining a line-disconnect of the communications device;
determining porting of the subscriber identifier corresponding to the communications device;
determining occurrence of at least one previous interaction between the authenticator and the communications device;
determining a measure of activity of the communications device;
determining whether an identification of a party accompanies an outgoing communication involving the communications device;
determining whether a multi-factor authentication occurred involving the communications device; and/or
determining whether the communications device corresponds to a non-mobile device.
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