To resolve the issue of incoming calls going straight to missed calls on your second phone number, follow these step-by-step instructions:

1. Check Call Forwarding Settings:
- Go to your phone's Settings.
- Select Phone, then tap on Call Forwarding.
- Make sure that the call forwarding option is turned off for your second phone number. If it is on, disable it to prevent calls from being redirected elsewhere - learn more.

2. Ensure Do Not Disturb is Disabled:
- Navigate to Settings.
- Select Do Not Disturb.
- Make sure that this feature is turned off, as it could cause incoming calls to be silenced and show up as missed calls - learn more.

3. Review Connectivity:
- Verify that your phone has a stable network connection. Check if you are connected to Wi-Fi or have good cellular signal.
- Sometimes calls may not come through if the connection is weak.

4. Check App Settings (if using a VoIP app like Google Voice):
- Open the app associated with your second phone number.
- Make sure notifications are enabled to alert you of incoming calls.
- Look into the settings to verify that your number is set up correctly and is ready to receive calls. Disable any features like "Do Not Disturb" within the app - learn more.

5. Restart Your Device:
- Simply restart your phone. This can refresh network settings and resolve temporary glitches that may be causing the missed call issue.

6. Check for Software Updates:
- Go to Settings > General > Software Update.
- If an update is available, download and install it. Software updates often include bug fixes that can resolve unknown issues.

7. Verify Account Settings:
- If you have linked your second phone number to a specific service (like Google Voice), check your account settings through the service’s site or app for any issues or updates that might affect call reception.

8. Contact Support:
- If the above steps do not resolve the issue, contact your service provider or the support team of the app that manages your second phone number for personalized assistance.

By following these steps, you should be able to address the issue of incoming calls going directly to missed calls. If the problem persists, further investigation with your service provider might be necessary to diagnose the problem accurately.

How to adjust call settings for additional phone number?

To adjust call settings for your additional phone number on an iPhone using the dual SIM feature, follow these steps:

1. Access Settings:
- Open the Settings app on your iPhone.

2. Navigate to Cellular:
- Scroll down and select Cellular or Mobile Data.

3. Select the Number:
- You will see your cellular plans listed. Tap on the number associated with your second phone line that you want to adjust settings for.

4. Adjust Call Settings:
- Here you can adjust various options:
- Default Line: You can set which line will be used for voice calls by selecting Default Voice Line.
- Cellular Data: If you want to use a specific plan for data, you can set that here as well.
- Labeling: Make sure that each plan is labeled clearly (e.g., Personal, Work) for easy identification - learn more.

5. Set Preference for Calls:
- If you want to choose which line to use when making a call from your contacts, go back to Cellular settings, and ensure that you have the option to select the line before making calls enabled - learn more.

6. Choose SIM for Contacts:
- In your Contacts app, you can set a preferred SIM for individual contacts by selecting the desired contact, tapping "Edit," and then choosing the preferred line for calls if you wish to override the default settings.

7. Testing:
- Make a test call to ensure that the settings have been applied as expected. You should be able to select which line to use when initiating calls.

By following these instructions, you can effectively manage and adjust call settings for your additional phone number on your iPhone. If you encounter issues, consider restarting your device or checking for any software updates that might be available.