While on a time travel mission in 1996, Tom Paris was asked for his phone number by Rain Robinson. (VOY: "Future's End") In 2286, James T. Kirk asked Gillian Taylor how he would find her, for as they said in her century (the 20th century), "I don't even have your telephone number." She said not to worry about that for, if she wanted, she would find him. (Star Trek IV: The Voyage Home) In 2375, after Ezri Dax reminded Vic Fontaine that he knew how to contact her if he had any more concerns about Nog's rehabilitation, he replied, "I got your number". (DS9: "It's Only a Paper Moon")