Stephanie is Spencer's blind date in iWin a Date, but he breaks up with her because she is annoying. For example, she was annoying him with her fake unicorn, thinking it was real. Like Socko and also most of Sam's family, she is never actually seen in the show, but is only mentioned. Spencer talks to her on his phone, but her voice is never actually heard during the conversation. She is not mentioned again after this episode.
There are three other characters on iCarly named Stephanie: