Related articles:
North American Numbering Plan
Key terms:
call
numbers
prefix
routing
digits
area code
telephone
dialed
provider
caller
accessed
mci
acd
trunk
call centers
nanp
scp
freephone
tod
ssp
toll free
pay phones
mobile phone
vanity number
free call
vonage
cell phones
free phone
per minute
freephone numbers
telephone number
trunk code
local call
phone services
post office
portability
collect call
calling card
make changes
numero verde
telecommunication
send the call
long distance
followed by six
calling service
telephone carrier
northwestern bell
these numbers are called
telephone operator
reserved for future
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