I updated my game. One of my sims called about finding a ring in her boyfriend's stuff. Can't remember the specifics. After 10 seconds of staring at the screen :D I said no. The reply for this was: "You think so? I wasn't sure... but you're right. I guess it just wasn't written in the stars."
I love to take pictures of every special moment so I don't think I'll say yes to these engagement calls that often. I didn't feel like answering the phone after that. For now, at least you won't get the pop up window unless you click to answer the phone.
Edit: I'll see how it goes in other households.