> For the complete documentation index, see [llms.txt](https://smartpossdk.gitbook.io/cloudpossdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://smartpossdk.gitbook.io/cloudpossdk/faq/sim-ethenet-wifi/troubleshoot-terminal-sim-signal.md).

# 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)![](/files/M6HqpuKeGqSthZX8thCt)

* 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="/files/w8ZhrGZZZQkzh01KBGqM" 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.