Hello, I had an older plan for 45 $ a month with 500 MB of data. The billing cycle is August 9th to September 9th. My phone broke part way through and I switched to a new phone and plan. The new plan is for 40$ and 1 GB of data. I already used up my old data. I don't understand what to expect on my bill for September 9th. Would it be 45 (and any additional charges because I went over data) + 40 + the next month in advance, 40? Or would it be split according to the number of days in each plan? Does it matter how much data from now till September 9th, can I still use my 1 GB or is it pay per use data till then or something? I'm confused about the proration works when switching plans. Thank you!