Spreadsheet files like XLSX were never designed for mobile contact import. Phones expect a structured contact format, where each contact is a self-contained record with defined attributes. In Excel, contacts exist as rows, and phones cannot reliably interpret which column represents mobile, work, or home numbers. This leads to unsupported contact format errors or rejected imports. VCF files, on the other hand, are built specifically for mobile contact import, which is why Android and iPhone accept them without issues. Users who regularly move spreadsheet contacts to phones often rely on tools like Softaken Excel to VCF Converter to transform flat spreadsheet data into phone-ready contact files using proper field mapping.

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