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Missing data commonly occurs due to improper field alignment between CSV columns and vCard properties. So the solution is to check all the contact details before conversion and ensure that each CSV column is correctly mapped to its corresponding vCard field. I am also using a user-trusted contacts management utility called WholeClear CSV to VCF Converter, which offers a preview and manual mapping feature that helps confirm that names, phone numbers, emails, and other details are correctly assigned. Plus, it ensures complete data transfer without information loss. You can use this solution without any technical skills or internet access, because the tool offers an easy-to-use interface. With the help of this independent offline software, your contacts can be easily and safely imported into any Android device after CSV contact migration. Try a free demo and explore the tool.