X.
ack
spam
cardphone
radiogram
international call sign
NCTA
eavesdropping
flaps and seals
correspondence
electronic signature
CCITT High Level Language
telepresencing
textism
niner
hotline
pager
telecommunicative
communicational
squawker
squawk box
telecommunication
411
ITSO
telework
zip code
LoRa
feed back
intercom speaker
feedback
telephone message
telex
cyber-terrorism
black room
phone message
aerophilatelic
e-mailbox
cyberwar
wirer
spamming
pseudo-city code
radiotelegraph
e-alert
teleconferencing
wireless telegraphy
wireless telegraph
lucigraph
radiotelegraphy
message
wire
Stone Ghost
e-tail
savingram
International Telecommunication Union
teletex
telecom
telephone line
phone line
subscriber line
electrotelegraphic
wireless
cybercommuter
OLDI
line
Communications Security Establishment Canada
interphone
mailless
tapper
exit code
phone tapper
V-mail
telecommunicate
codetalker
teledocumentation
wiretapper
telephone circuit
811
accountable mail
sigless
transmissory
e-postcard
pound sign
touch-tone
telegraph pole
lawful interception
by wire
local battery
telegraphing
zero prefix
telegraph operator
telegraphist
telegrapher
phonemic system
mail
send word
roger that
roger