The Retro Phone display shows name and number of incoming call even if you're on the phone with another caller. Memory holds information for the latest 75 calls. Caller ID Review and Delete allows you to scroll through the list of incoming calls and delete those not wanted. New Call Indicator alerts user that new call was received. 10 Number Memory speeds dialing of frequently used numbers. Flash Function allows access to subscription telephone services like 3-Way calling. Tone/Pulse Switchable Dialing - Allows any combination of tone and pulse for access to long-distance service.