Calling a Web UI test from a mobile test case


My requirement is to combine both Mobile and Web UI tests. For ex: I want to open an app, enter mobile number, and open a Web DB (querying a DB from UI) to get OTP and enter the fetched OTP in Mobile again.
While running individually my Mobile UI cases opening a browser in my system. but when called Web UI function from a Mobile test case (Run > selected Android (default) ), the browser is opening in the mobile not in the system.

Please let me know how we can use/combine Mobile and Web tests in a single test case.

Ravi B