Handy Hints

How to Make a Cup and String Phone

Drop the smart phones and tablets – it’s time for a communication throwback with a cup and string phone! Kids will be amazed by this simple homemade Hefty® Everyday™ Red Cups and string telephone device that can be used around the house, in the backyard or as a tree house staple. Spill the silliest jokes or communicate very important messages. The best part about a cup and string phone? No yelling required. 

Fun fact: When you speak directly into your cup, it vibrates 1,000 times per second (or more!) with sound waves. These vibrations travel through the taut string and into the listener’s cup. Voila, message received!


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