Hello,

Could you please clarify what do you mean by "page"? I assume you refer to the View component of mobile application. 
You are not supposed to put all of the code in one file, it is possible to divide the application views into separate files and load them as a "remote view". Actually there is an online demo that demonstrates this scenario. The most important parts are:

• linking to the remote view - if the navigational widget href attribute value does not start with a hash (#), the application considers the View to be remote, and issues an AJAX request to the provided URL.
  
  <ul data-role="listview" data-style="inset">

      <li><a href="remoteview.html">Remote View</a></li>

  </ul>
• remote view markup
  
  <!-- remoteview.html -->

  <div data-role="view" id="remoteview" data-layout="mobile-view" data-title="Remote View">

      <p>Hi, I'm a remote view.</p>

  </div>

In addition I would recommend checking the Remote Views help article from the documentation - it gives a more detailed information about how loading of remote views works.

I hope this information will help.

Regards,
Alexander Valchev
the Telerik team