Telephone
Telephone numbers should best be written in international format:
Generally, the number consists of the land code, followed by the area code (without 0), and than the subscribers number, all without dashes, slashes, and the like.
+32 AA BB BB BB, or +32 A BBB BB BB for landlines,
+32 4AA BB BB BB or +32 4AA BBB BBB for mobile numbers
+31 AA BBBBBBBB, or +31 AAA BBBBBBB for landlines,
+31 6 CBBBBBBB for mobile numbers
+352 local number (varies in amount of numbers and areas)