Clue: It's a mix of 350 Hz and 440 Hz in the United States
We have 1 answer for the clue It's a mix of 350 Hz and 440 Hz in the United States. See the results below.
Possible Answers:
Related Clues:
- It may follow a click
- 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
Last Seen In:
- Post Puzzler - June 10, 2012
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