FORMAT REFERENCE
The TEL Property in vCard
TEL carries a phone number and may include type parameters such as cell, work, home, or preferred.
Last reviewed
Keep phone values as text
Phone numbers are identifiers, not quantities. Spreadsheet conversions should preserve leading zeros, plus signs, spaces, and extensions as text.
Types are hints
Different applications support different type names. When compatibility matters, use common labels and validate the output in the destination workflow.