This Casio told you of incoming calls without Wi-Fi or Bluetooth
The Casio Vivcel watch, released in the late 1990s, could alert users to incoming phone calls using a built-in receiver that detected signals from the AMPS analog cellular network. It operated without Wi-Fi or Bluetooth, relying instead on radio frequencies transmitted through early cell networks. While innovative for its time, the device could not distinguish between different AMPS signals, leading to unintended vibrations when nearby devices received calls.
- ▪The Casio Vivcel watch used a built-in receiver to detect incoming calls via the AMPS analog cellular network.
- ▪AMPS was an analog mobile phone system used in the 1990s that transmitted unencrypted voice signals over radio frequencies.
- ▪The Casio VCL-120 included features like world time, an alarm, a stopwatch, and electroluminescent backlighting.
- ▪Because the watch couldn't differentiate between AMPS signals, it might vibrate in response to any nearby AMPS call.
- ▪Casio's design relied on the widespread use of AMPS networks before the adoption of digital cellular technologies.
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