... has not yet been approved or rejected. You mentioned that a character having a flip phone instead of an "Iphone" (which I assume is supposed to be an iPhone) makes the show an Unintentional Period Piece.
I now get to point out to you the trope Small Reference Pools, and the May 2024 news articles Going old school: Ottawa teen flips the script on smartphones and Samsung sole winner as US smartphone market hits sixth quarterly decline in a row. Having an iPhone instead of a flip phone would have made the work an unintentional period piece, not the other way around.