BT Premium Phone - changing imported mobile contacts sort order
When I import contacts to the Premium Phone from my mobile, the sort order is by first name but the sort order in my mobile is set to last name in my mobile contacts app. I have a Samsung Galaxy S4 and the contacts app syncs its contacts with outlook for desktop. There doesn't appear to be a way to change the sort order in Premium Phone.
How do I get the Premium Phone to sort by last name?