whether or not you can still make calls isn't everything the smartphone does. It's possible that you could spend <=$100 for the replacement screen but still discover that other things do not function. YMMV. Here's a link to a replacement LCD-
Given the almost commodity-like prices on some of these phones w/ 2 year contracts, you might take one for the team and see if you can get an early upgrade from your carrier. Not being particular fond of contracts, this is merely economic advice if it makes sense for your particular situation and is a valid option.
I have a Samsung Galaxy S and i ran it over with my truck. It still rings, but nothing on the screen. Is it fixable and worth it????? Please help!