Add Aura Components as Custom Tabs in Salesforce Mobile Web

Make your Lightning components available for Salesforce mobile web users by displaying them in a custom tab.

To configure an Aura component to be used as a custom tab, see Configure Components for Custom Tabs.

Include your component in the Salesforce mobile web navigation menu by following these steps.

Create a custom Lightning component tab for the component. From Setup, enter Tabs in the Quick Find box, then select Tabs.

You must create a custom Lightning component tab before you can add your component to the navigation menu.
Note
Add your Lightning component to the Salesforce mobile web navigation menu.
1. From Setup, enter Navigation in the Quick Find box, then select Salesforce Navigation.
2. Select the custom tab you just created and click Add.
3. Sort items by selecting them and clicking Up or Down.
  In the navigation menu, items appear in the order you specify. The first item in the Selected list becomes your users’ landing page.
Check your output by going to Salesforce mobile web. Your new menu item should appear in the navigation menu.

By default, Salesforce mobile web is turned on for your org..
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Lightning Aura Components Developer Guide