I could not import phone data into my cck phone field made with the latest phone module. At the 'Map file columns (step 4 of 8),' my phone field was ignored. But renaming function name and file name from 'phone' to 'cck_phone'(see below) solved the issue. After renaming, at the mapping step this modules labeled 'Unsupported' to the field, but import was successful for me. I've just tried number section of the field, so don't know about country code and extension.

What I did:
renamed filename: 'supported/phone/phone.inc' to 'supported/phone/cck_phone.inc'
renamed function name: 'phone_node_import_fields' to 'cck_phone_node_import_fields'

My environment:
Drupal version: 6.26
MySQl version: 5.0.95
PHP version: 5.3.3
CCK version: 6.x-2.9
Phone version: 6.x-1.0