When you want to send your contacts entries, you can combine them all into one file, or you can send separate vCard files.
To set the transfer type, from the Contacts application, tap the Menu Key (in the Front Touch Keys bar) > Settings > Transfer type.
Send as one file: This setting combines all of your contacts into one file. It allows a faster transfer, but some devices can't receive contact information sent using this option.
Send separately: This setting sends each contact as a separate vCard file. It allows all devices to receive your files.