fluffy 90% of the episodes would have had to have completely different plots.
Cena_mark If Seinfeld had cellphones then the show would be about the problems cell phones cause, not the problems they can potentially solve.
Bort George would be hoarding his minutes and Kramer would have some fifth tier service that was good at everything except talking and texting within the United States. Jerry would always be upgrading his phones and never quite know how they work. And Elaine would be paranoid about answering her phone after making Youtube videos about misogyny in sitcoms.