Here’s what’s happening: contact apps don’t read Excel the same way. Excel files are flexible by nature. One app might interpret a column as a phone number , while another treats the same value as plain text. Encoding, delimiters and header recognition also vary across apps. So the same Excel file can import cleanly in one place and fail in another. Contact apps are designed around fixed contact standards, not spreadsheets. That mismatch causes inconsistent results. This is why people usually convert Excel files into vCard first. An Excel to VCF Converter applies consistent contact rules before import. Tools like Softaken Excel to VCF Converter normalize the data so different apps interpret contacts the same way.