Methods and systems are disclosed for capturing consumer voice signatures. The methods and systems synchronize voice signatures with display of the terms and conditions of a transaction to the consumer in real time during a phone conversation. In one implementation, mobile devices with text display capability may be used to display the terms/conditions of the transaction while the consumer is talking to a customer service representative or an interactive voice response system. The terms/conditions may be displayed as a scrollable document on the mobile device to which the consumer may then agree during the phone conversation. The consumer may then “voice sign” by reading the displayed terms/conditions, or some portion thereof, during the phone conversation to manifest his/her knowing consent. Such an arrangement helps promotes the use of voice signatures by consumers in a manner that complies with the requirements of the federal E-Sign Act.