calls taking place inside of south sudan have a simple format of "mm nnn nnnn" (where "mm" represents the mobile code and "nnn nnnn" represents the local number). an itu is not required for national calls. for example, a person in south sudan contacting another person in the same country with a mobile code of "55" and a local number of "555-5555" would have a telephone number of 55 555 5555.