Can you keep Xfinity Mobile Service when cancelling Xfinity Internet and TV

I was told when ordering new Mobile Phones that I could switch my Xfinity Internet and TV services to another carrier if I found something that better fits my needs and it would have no affect on my Mobile Services. I remember at one time there was a $25 fee per line change if you didn't have Xfinity Internet or TV services. The rep I was ordering from had no idea what I was talking about. Does anyone from Xfinity know the correct answer. Thanks