Why do phone numbers go missing when converting CSV to VCF manually?

J

Jameswhite

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Jan 14, 2026
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I noticed this issue when I tried converting contacts manually using system tools. Phone numbers went missing because manual methods don’t map CSV fields correctly to vCard fields. If your CSV has custom columns or multiple phone fields, manual conversion often ignores them. This gets worse with large files. After facing repeated issues, I used GainTools CSV to VCF Converter, which lets you preview contacts and map each field properly. That helped me keep all phone numbers intact during bulk conversion. This is an offline utility and works on all Windows versions, and easily converts any CSV to any version of the vCard file format. Best solution for personal and business contact management. It offers a free demo for testing tool so you can try it for free.
 
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