To add an entry’s number to your Contacts

Tap and hold the call entry.

Tap Edit number before call in the Context menu that appears. The Dial screen is displayed so you can edit the number, if necessary, before adding it to your Contacts list.

Tap the Menu Key then tap Add to Contacts.

Tap an existing contact entry to add the new number to it or tap the Create new contact icon to save it as a new entry.