Or, does my phone communicate via wifi with Zwift laptop app?
What Android app? Where did you find it?
You just need to be on the same wifi network as your pc or laptop and you can find mobile app in google playstore.
Search the google play store for Zwift and the app will come up. There will be a general announcement shortly. It works great.
My first ride with the Zwift Mobile Link Android app. I started Zwift (laptop) and then had to re-login to ZML. Once in, the app is pretty cool and brings a lot of functionality. After about 60 mins, the mobile app suddenly ‘timed out’ or something and put me back in the available rider list mode. The app dropped the wifi connection briefly I would presume.
All in all, a big congrats to the Zwift dev team. You guys are putting out feature enhancements at a rapid pace across platforms. Release, iterate, iterate, iterate. Something Google pioneered!