These days, I don't see iron mortars and pestles in Indian cities. We've mostly switched to ready-made masalas. You can still see some stone grinders, though.
My mum has a tiny stone mortar-and-pestle, which she uses to make fresh garam masala for cooking. I have a small one too, that I use for crushing garlic, green chili and ginger. Every time a green chili crunches satisfying under the pestle, it awakens something atavistic in me. Take that! I want to say. And that! And that!
My motorised grinder isn't half as fun!