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 Maryland
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 2I2 555 I2I2
international operator
(call from inside the US)
I0I0 2220

Fire 9II  Police 9II

calling from overseas
(out of North America)
to the Maryland
+I --- --- ----