08 October 2020
UPDATE (October 8th, 2020):
The ability to play Google Stadia games via mobile internet connection has now exited the experimental stage. The setting for the feature has now been moved from the Experimental section to the Performance tab within app settings. However, Stadia restricts game streaming to 720p while using a mobile connection. There is also a warning that the data consumption could increase by up to 2.7GB per hour if played on mobile data.
Original (July 29th, 2020)
Google Stadia has finally received support for 4G and 5G networks. The newly added support has been introduced as part of experimental features. It means the feature is still in the testing phase and will have to be enabled manually. This is aimed at giving more freedom to gamers in terms of streaming their favorite games
To make use of this feature, a user will need to visit the Google Stadia app and tap on the avatar. There will be a bunch of options where one will need to tap on the "Experiments" option. There will be a new option called Use Mobile Data which needs to be enabled. This is the option that will let users make use of the cellular connection for streaming games.
A user will need to be on either 4G or 5G connectivity to be able to play games on a mobile internet connection. As of now, Google has not said anything about the stream quality that will be offered. It is likely to be lower than the quality Google offers on WiFi connection because of cellular plans usually being limited.
Here is what Google said in the announcement:
"Try games on Stadia using 4G and 5G with a new Stadia Experiment launching July 28. If you’d like to be part of this Experiment, you can opt in to cellular play by opening the Stadia app on an Android phone, clicking on your avatar in the top right corner, selecting Experiments, and then choosing Use Mobile Data."