Assertion: phone number | /r/MadeOf | a 3 digit area code
Facets:
Source sentences:
text: Phone numbers can consist of a 2 digit (NN) area code plus an eight digit local number (ABCD XXXX) or a 3 digit area code (NNN) plus a seven digit local number (ABC XXXX).
text: For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number.