I found some sessions with 0byte data usage randomly as the screenshot.
Sometimes, there are a couple of 0 byte sessions together.
Could anyone know why?
Thanks!
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It can be confusing to experience 0 byte data usage on your Hologram device. The following typical causes and troubleshooting techniques may assist to explain this problem below 
- Inactive or Improperly Configured Device
- Network Connectivity Issues
- Device Sleep Mode
- SIM Card Activation
- Incorrect Data Plan Configuration
- Hologram Dashboard Settings
Follow this for reference: https://www.quora.com/What-does-it-mean-if-0-bytes-show-on-a-website