This is kinda silly and trivial, but I was recently watching Season 4 for the umpteenth time and something took me by surprise, considering David Chase's great attention to detail. I can't believe I never noticed it before.

Remember when Paulie was in jail in Ohio and he made several collect calls to Johnny Sack (one of which was about the fat joke that Ralphie made about Ginny)?

Well, Johnny clearly accepted one of the phone calls (if not all of them) on his cell phone. So since when can you get a collect call on a cell phone?

You can't.

I'm just sayin .