You want to save the contact details in the Google Sheet for future reference of your family members are your business people numbers for your business related processes. But the most of the people facing some default in the save the number contact number in the Google Sheet.
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In the mobile are landline number we used some special character like plus [+], minus [-]. The Google Sheet cell will confuse on the special character, whether it will be an Arithmetic value.
Buy solving this issue you can enter the mobile in the cell like this way
First, start with = and enter “ and end number with “
Just start with a single quote ‘ and followed by your number.