A few months ago when we switched to a new commenting platform, we unfortunately discovered that the platform was not compatible with our app. So currently the commenting feature is temporarily unavailable on both iOS and Android CNET mobile app.
The good news is we are in the process of getting comments back into our app but it will require development time to make the new commenting platform play nicely with our app. It's not going to be a simple project, but we are working on it. I do apologize for the inconvenience. We definitely will get that feature back into the app and your patience is appreciated.
FWIW commenting is available on mobile web, just not in our app.
Again I'm sorry for the inconvenience!