Related terms:
numbering plan
nanp
nanpa
dialing
callers must
seven digit
toll alerting
overlays
telephone numbers
area codes in massachusetts
country calling
overlay area code
calling codes
overlay plan
suburbs of chicago
Wikipedia sources:
List of country calling codes
Telephone numbering plan
North American Numbering Plan
Area code 868
Area code 246
555 (telephone number)
Telephone numbers in the Americas
Vertical service code
Area codes in the Caribbean
Overlay plan
Telephone numbers in the Dominican Republic
Area codes 781 and 339
Area codes 630 and 331
Area code 814
Area code 917
Area code 717
Ten-digit dialing
Area code 202
Area code 268
Area code 264
Area code 413
List of Illinois area codes
Area code 784
Area code 649
Area code 721
Area code 664
Area code 312
Area code 212
Context for words:
north
american
numbering
plan
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