The most interesting aspect about "Diary of a Telephone Operator" is that the sex-obsessed characters here are women instead of men for a change. However, whether you are a woman or a man, odds are that you'll find this so-called comedy very tiresome. There's not much of a plot here, for starters, and the movie takes forever to get going. And when it does, it moves very slowly. The movie is more a collection of vignettes than anything else. This might not be so bad had the movie been funny, but it really isn't. The humor is too low-key, and it's hard to warm up to the lead characters since they aren't very sympathetic.
By the way, despite the title, there's actually very little telephone operating on display here.