I understand you didn't receive an incoming call and only saw a missed call notification. Here are several potential reasons this might happen:

1. Filtering options:

  • Your phone might have "Silence Unknown Callers" or "Call Blocking & Identification" enabled. These features block or silence calls from unknown numbers, which could include the missed call you didn't receive.
  • To learn more about managing these settings, please visit the Apple website(link not provided due to policy).

2. Do Not Disturb mode:

  • If "Do Not Disturb mode" is active, even allowed calls might not ring or vibrate, only showing up as missed calls later.To check this:
    • Open the Settings app on your device.
    • Tap "Do Not Disturb" and ensure it's disabled (turned off).

3. Incorrect device time and date:

  • If your device's time and date are not set to automatic, it might cause inconsistencies with receiving calls at the correct time.To fix this:
    • Open the "Settings" app on your device.
    •  Tap "General" and then "Date & Time".
    • Ensure "Set Automatically" is enabled (turned on).

In addition to the above, here are some extra tips:

  • Restart your device: This can sometimes resolve minor software glitches that might be affecting call functionality.
  • Check for app updates: Ensure you have the latest version of the 2ndLine app installed, as updates often include bug fixes and performance improvements.
  • Contact 2ndLine support: If the issue persists after checking the suggestions above, feel free to contact the 2ndLine support team for further assistance. They may be able to help investigate the cause of the missed call and offer additional troubleshooting steps.