Did a search for this and it has come up before but I wasn't able to find a solution. Apparently this issue is caused by Into The Future.
Basically, the phone rings and my sim can ignore it, no opportunity comes up on the screen as it would usually. It could of course have just been another sim calling, but my sim at this point in the game didn't know anybody. I also know it's an opportunity issue because even when my sim answers, nothing happens. She isn't talking to another sim, but no opportunity prompt comes up on the screen either. It has now been weeks in game and she has never gotten a single opportunity in spite of having learned lots of skill points.
I don't have suppressed opportunities ticked, and this happens in all of my files. Is there any way to fix this that doesn't involve uninstalling Into The Future? It'd be a bit of a waste of money if I had to uninstall it just to get this pretty integral feature of the game...