Dual-frequency isn't something you can manually turn on or off, so you should just be able to run a test (I would first verify you see multiple signals with different CF but same ID in GPSTest Status view to verify you're seeing dual-frequency info). You may want to disable duty cycling for best results on Android 9 Pie or higher via developer mode - but just track whether or not duty cycling is active for each test, as it could potentially alter results.

Improving the world, one byte at a time. @sjbarbeau, https://github.com/barbeau, https://www.linkedin.com/in/seanbarbeau/. I work @CUTRUSF. Posts are my own.

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store