Faulty phone numbers come about due to the fact that Excel at times saves the digits in short number format or drops the leading zeros. People are usually that they only realize this after the attempt to Export Excel contacts to VCF has been made. The most effective way is to change the format of the number column to Text before to the conversion. This keeps the exact digits intact. Devices which correctly take the number fields reduce the problem. The OSTtoPST App Excel to vCard Converter is a great tool for users to keep the number formats consistent while performing Excel to vCard Conversion, thus it is more secure to Convert Excel to vCard without the original structure being lost.