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Answer: DIALTONE
DIALTONE is a crossword puzzle answer that we have spotted 22 times.
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Indication of service availability
Sound after a hang-up
"It's okay to call now" signal
Receiver sound
Signal to place a call
Caller's need
Cell phone's lack
"Ready" signal of a kind
Landline signal
Sound from a receiver
Calling sound
Phone sound
Hum on a line
'Go ahead and call' sound
Hum on the line
Caller's go-ahead
It's a mix of 350 Hz and 440 Hz in the United States
Landline sound
Feature of a landline, but not a cellphone
Sound around a cradle
Sound on a landline phone