The concept of a cup phone, using two cups and a string, is not attributed to a specific inventor. It is a classic example of a simple, homemade device that demonstrates the principles of sound transmission.

The concept of sound transmission through a string or wire is believed to have been known for centuries.

Here's why it's unlikely there is a single inventor:

* Folklore: Cup phones are often found in folk traditions and stories, suggesting a long history of use.

* Simple physics: The underlying principle of sound waves traveling through a medium (like a string) is a basic scientific concept.

* No patent or documentation: There's no record of a specific individual claiming invention or patenting the cup phone.

While no one person gets credit for the invention, the cup phone is a fun and effective demonstration of basic scientific principles.