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Old style cup phone with red string at the center, concept for two way communication, information transmission, sender and receiver, communicate with each other Photos | Adobe Stock
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Old style cup phone with red string on white background, two way communication, information transmission, sender and receiver, communicate with each other Photos | Adobe Stock
![How to make a String Phone using Paper Cup| Science behind String phone| Make Your Own String Phone - YouTube How to make a String Phone using Paper Cup| Science behind String phone| Make Your Own String Phone - YouTube](https://i.ytimg.com/vi/uf4rH_MERBU/sddefault.jpg)
How to make a String Phone using Paper Cup| Science behind String phone| Make Your Own String Phone - YouTube
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