Phone number formatting

Phone number formatting
OL2003
Hi
How I can remove the brackets insertion in the contacts
phone formatting
My phone list includes a lot of foreign phone numbers that
hold different number of digits
All the phone numbers of the contacts list are formatted
with brackets positioned differently according to digit
number

Actions / Call contacts / New calls / Dialing
options /setting for phone number formatting and dialing
shows an unchecked and not accessible "Automatically add
country code to local phone number"
Is there someone who can give me the clue on how to remove
the brackets insertion on phone number formatting?
Thanks