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Understand what the LED lights on your Sprint 3G/4G USB U600 mean

Last Updated: Nov 16, 2013

Your Sprint 3G/4G USB U600 has LED lights that help you know what your device is doing.


If you're in 3G mode and the LED is:

  • Off - No power or not connected to 3G
  • Solid Green - 3G in service and stand by, ready to connect
  • Flashing Green every second - No 3G service or still acquiring service
  • Flashing Green every 3 seconds - 3G is connected but dormant
  • Fast flashing Green - 3G is connected and active; data is being transferred
  • Solid Red - Powering on or resetting


If you're in 4G mode and the LED is:

  • Off - No power or not connected to 4G; idle mode; no data activity
  • Solid Red - No 4G service or still acquiring service
  • Flashing Red - 4G error; firmware downloading
  • Flashing Blue - 4G is connected and active; data is being transferred (will flash by data speed)

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