Before revision: Infone identified a registered user (along with billing information; the service was only payable by credit card) by caller ID ( number were registered on signing up) and by an advanced voiceprint recognition system from SpeechWorks that identified the user when the user called from an un-registered telephone number (or no caller ID) through the use of a personal phrase spoken by the user (e.g., "Hello Infone!")
After revision: Infone identified a registered user (along with billing information; the service was only payable by credit card) by caller ID ( numbers were registered on signing up) and by an advanced voiceprint recognition system from SpeechWorks that identified the user when the user called from an un-registered telephone number (or no caller ID) through the use of a personal phrase spoken by the user (e.g., "Hello Infone!")