Before a single tap could place a call, dialing a phone number took real, deliberate effort. The rotary phone dial sound effect brings that tedious, clicking process back for a genuinely funny old-versus-new comedic contrast.
Why the clicking dial sound is so recognizable
The distinctive mechanical clicking of a rotary dial was once a universal, everyday sound, and its specific rhythm remains instantly identifiable as old-fashioned phone technology, even to viewers who've never actually used a rotary phone themselves. 
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A sound that communicates "slow" instantly
Beyond just sounding retro, the mechanical, drawn-out clicking of this sound inherently communicates tedium and slowness, making it an efficient audio shorthand for "this used to take forever" without needing any additional explanation.
Best moments to use it
This sound effect works well for an old-fashioned comedic contrast — highlighting just how slow or tedious an old process was compared to how instant equivalent tasks are today, using the sound as a nostalgic, comedic punchline.
Keeping the clip length tight
A partial dialing sequence, just long enough to clearly establish the retro reference, usually works better than a full drawn-out dial sequence that risks slowing down the overall comedic pacing of the edit.
Beyond just phone-related jokes
While most associated with phone-specific humor, this sound can also work more broadly as a general "old and slow technology" reference, fitting alongside other retro tech sounds for a wider throwback joke.
Pairing it with other retro tech sounds
This sound pairs naturally with other nostalgic technology audio references, similar to how the dial-up modem connecting sound effect for nostalgia edits captures a different but related wave of old-technology nostalgia.
Conclusion
The rotary phone dial sound effect turns an old, tedious process into a sharp, nostalgic comedic contrast. Browse SoundGIFs' sound effects library for more retro sounds worth adding to your next edit.