phone system
local calls
no area code inside
the same area

national long distance
national prefix: I
area code: ---  (always 3 digits)
number: --- ----   (always 7 digits)

international calls
international prefix: 0II
country code: - or -- or ---
number: ???

exeption !   Canada or
the Carribbeans
     (I --- --- ----)
are also part of the
North American
numbering Plan (NANP)

exampe
calling from Iowa
to Phonebook of the World
in France

0II 33 I 422I IIII
II rue des IIaIIes
PARIS Ier

usefull numbers
american operator 4II
call the operator from
outside the US
+I 3I9 555 I2I2
international operator
(call from inside the US)
I0I0 2220
Fire 9II Police 9II

calling from outside
north America
to Iowa
+I 3I9 --- ----
+I 5I5 --- ----
+I 7I2 --- ----