Luxembourg is a founding member of the European Union and the only Grand Duchy in the world. French and German are generally used for administrative and commercial purposes. Many Luxembourgers also speak English. 220 volts AC, 50Hz. Full IDD is available.
International phones have a yellow sign showing a telephone dial with a receiver in the centre.
There are facilities at the post office at 25 rue Aldringen, Luxembourg-Ville, and in all major towns. Hotels often allow guests to use their facilities. Post to other European destinations takes two to four days. There are poste restante facilities throughout the country. Prospective recipients must first register for a PO Box.