You can use CRM server serving from your localhost as long is it is reachable from your mobile phone browser.

Use ipconfig (for Window) or ifconfig for Unix like system to get your local ip. In your mobile browser, check URL of the CRM with local ip such as where localhost is substitute with ip. You may also want to change CRM url in admin panel as well.

If it is working in browser, you can enter the URL in the app.