# Troubleshoot Terminal SIM Signal

When you insert a SIM card into your terminal, the response on the lock screen can help diagnose any signal issues. Here are steps to troubleshoot common signal problems:

### Scenario 1: "No SIM Card - Emergency Calls Only" Message

* Verify SIM Card Insertion: If the lock screen displays "No SIM card - Emergency calls only," first ensure that the SIM card is inserted correctly.

![caption](http://sdkwiki.wizarpos.com/images/e/eb/300px-Simcardplaceq2-1.png)![](https://3254882245-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTv6FkzHXX8QyxZpeenq6%2Fuploads%2FQx0SvcfZAOH1rO4GhJDx%2Fimage.png?alt=media\&token=74b980fa-5d17-404f-b610-e69562ffc1c7)

* Restart the Terminal: After correctly inserting the SIM card, restart your terminal. Note that the SIM card slot on the Q2 model does not support hot-plugging (inserting the SIM card while the terminal is powered on).

### Scenario 2: Blank or Forbidden Signal Icon

* Check Signal Icon: If the lock screen shows a blank signal or a forbidden signal icon (as illustrated below), the issue may be related to network settings.

<div align="left"><figure><img src="https://3254882245-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTv6FkzHXX8QyxZpeenq6%2Fuploads%2F8dSjbuOI8Ck5907MazIW%2Fimage.png?alt=media&#x26;token=5cf9d157-0469-449f-8ee6-05990bd7aa5a" alt=""><figcaption></figcaption></figure></div>

* Adjust Network Settings:
  * Go to 'Settings' > 'More' > 'Cellular Networks'.
  * Select 'Preferred Network Type'.
  * Ensure the network type is correctly set according to your SIM card's capabilities and network provider requirements.