1. A method comprising: receiving a service request from a remote communications device associated with a service account, wherein the service request identifies a contact phone number for the service account; validating the service request using one or more fraud evaluation processes, wherein the one or more fraud evaluation processes comprise a first fraud evaluation process, wherein validating the service request using the first fraud evaluation process comprises validating the contact phone number identified in the service request, and wherein validating the contact phone number identified in the service request comprises determining a count of other service accounts that are associated with the contact phone number; determining a respective score for each of the fraud evaluation processes, wherein determining a respective score for each of the fraud evaluation processes comprises determining a score for the first fraud evaluation process based at least in part on the count of other service accounts associated with the contact phone number; and evaluating the service request based on the respective scores.