PhoneQuest offered several adventure quests, in the style of Lone Wolf Gamebooks, which were played over the telephone. One of the main attractions of PhoneQuest was the presence of pre-recorded sounds applicable to the action, somewhat like a radio script, behind the voice of the narrator. Participants called a listed telephone number, made some setup decisions, and then listened to an introductory piece of the adventure. At a given point they were offered a decision and responded verbally. The response would then initiate the next stage of the adventure. The game was notable (at the time) for implementing voice recognition for play control.
PhoneQuest play incurred a per-minute charge to the calling number, including any applicable long-distance costs. The game was available only within certain calling areas in the UK and the USA.
The scenarios used a seven-digit PIC number, or Personal Identification Code, which could be used to store or retrieve a character and their progress in the TIME-FREEZER for up to 21 days.