Excel 2010 Vlookup

I am attaching a sample Excel file.  On Sheet 1 column A are phone numbers.  on Sheet 2 in Column A is a list of the phone numbers and in Column B is updated phone.  In column B (Sheet 1), I want write a Vlookup to Column A (Sheet 1) and then find a Match in Column A (Sheet 2) and bring back the Updated Phone Number Column B (Sheet 2) into Column B (Sheet 1).    I am working on a much larger Excel file the sample file,  but it's not working correctly (only some of the numbers are populating). So I think I might be doing the Vlookup incorrectly.   Any info is greatly appreciated, thank you.
Book1.xlsx