This may be a stupid question but not 100% on this.
I got a Samsung Galaxy S8 last year (2017) & it is now currently crapping out on me exactly 1 year later. I still have a 400 some dollar balance left on it. Can I just put my SIM card back into my old iPhone 6 and just let the balance on the S8 run out? Or will I get charged the remaining balance since I would be switching devices?