This happened to my dad once when I was a kid, but obviously not with a cell phone but rather his keys. We learned a few things that day, one of which is that cast iron storm drain grates are even heavier than they look, but the other was that if you get your hands on a big prybar you get all Archimedes in its face and not have to lift the damn thing.

If you’re e.g. an average apartment dweller and haven’t got a 7’ prybar in your shed, I don’t know what to tell you.