Xfinity Mobile question

I am seriously considering switching internet providers because my Xfinity internet keeps dropping out several times per day. This has happened many times over the years. Each time they send a technician out, they say everything looks good and nothing they can do. They leave. Then later that day or the next day, it’s dropping again. I know that my Xfinity Mobile plan will go up at least $25. What if I’m still a couple of months away from paying off my phone with Xfinity Mobile? Do my same device payments continue? Or do they go up too?