For calls to Dortmund please enter the dialling code 0231 and then the number of the person or household you want to reach.
|0231||Phone Code: Classic spelling|
|+49231||With german country code +49|
|+49(0)231||With country code +49 and optional 0|
|0049231||With country code 0049|
|(0231)||Telephone code in brackets|
|0231-||With hyphen as separator to the phone number|
|0231/||With slash as a separator to the phone number|