Unless you bought good insurance for the phone, you get to use it with a broken screen. Clear packing tape over the screen will help keep it together but be prepared for degraded performance over time. Start saving up for a new phone and think about the replacement insurance next time.
There's also a decent article on other alternatives at:
http://www.ehow.com/how_5202803_replace-fix-iphone-broken-screen.htmlincluding a link to yiutube video showing how to replace the screen (not recommended).
Hope this helped
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