An easily-recognizable code is a North American Numbering Plan area code where the second and third digits are identical, such as 800, 888, or 911. These codes are reserved for special purposes like toll-free calling, emergency services, or specific premium routing, because they are simple for the public to identify and remember.
Heard on the job
We need to provision a new ERC block for the updated toll-free routing plan.
Related terms
Prefix
The initial digits of a telephone number that route the call to a specific geographic region or service type.
DDD
Direct distance dialing allows callers to route long-distance calls without an operator.
Vanity number
A custom telephone number chosen because its digits map to a specific, memorable word on a dialpad.