Flashing Phone Stickers

December 19, 2024•112 words

Nearly a decade and a half ago, in the hey day of Nokia mobile phones, there were these stickers you could buy and stick on your phone. They would start flashing when you got a call and during. It was similar to how you could know a call was coming based on the hum from nearby speakers.

GSM Handsets operated at a higher RF power that enabled these passive electronics components to use it. Modern phone operate far more efficiently, there are no such stickers for phones today.

Hackaday article showing how the battery free flashing stickers worked.

Youtube video explaining how the flashing phone stickers of yeasteryears worked

tags: #tech

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Flashing Phone Stickers

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