If you had a Touch Tone phone, you could hold any button while on a call and the noise would annoy sales callers, or the creepy heavy breathers that would call.
If you had a Touch Tone phone, you could hold any button while on a call and the noise would annoy sales callers, or the creepy heavy breathers that would call.
Cell phones only register a momentary tone. Landlines (POTS) still do this though, yes.