Stupid excel question

Type a ' before the number or change the cell to text format.
 
Or, assuming all phone numbers are the same length, edit the cell format to make sure that the correct number of digits display.

Right-click > Format Cells

Under Number, select Custom and in the Type box, input in as many zeros as the length of your phone numbers. This will ensure that all numbers in the cells are displayed with that many digits.
 
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