I think many people these days sync all their information (including Contacts) to all their devices. However, some folks just operate from an iOS device exclusively. If you are one of these people, there may come a time when you need to export your Contacts into a VCF (Virtual Contact File) or Excel format for transfer to another device. For future reference, this article explains how to export your iPhone Contacts to VCF and also to Excel file format. It is a little involved, but a pretty straight forward process.