Context: The BBC also introduced Ceefax, the first teletext service, starting in 1974. This service allows BBC viewers to view textual information such as the latest news on their television. CEEFAX has not made a full transition to digital television, instead being replaced by the new interactive BBCi service.

Question: What kind of service was Ceefax?
Answer: teletext

Question: When was Ceefax launched?
Answer: 1974

Question: What is the modern replacement for Ceefax?
Answer: BBCi

Question: What service was launched in 1947?
Answer: Unanswerable

Question: When did Ceefax make the full transition to digital television?
Answer: Unanswerable

Question: Ceefex replaced what interactive service?
Answer: Unanswerable