> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://controlplus.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Does Control+ Support Landline Numbers?

If you tried adding a landline number to Control+, you may have noticed it isn't accepted. That's because Control+ currently only supports mobile numbers for call and SMS protection.

## Why Mobile Numbers Only?
Control+ is designed and optimized for mobile devices to provide real-time protection against spam calls, text scams, and other unwanted activity. Since landlines don't support SMS or mobile data, our system can't apply the same filtering and security measures effectively.

## What You Can Do
* **Use a mobile number instead:** Register your mobile number to start receiving full call and SMS protection right away.