I am not on a contract. I pay month by month, & my billing cycle ends in 16 days from today. My bill is due on February 21st, so when should I cancel my service. Is the month by month service paid beforehand, so what I'm paying on the 21st is for next month, or is it this month's bill? I just want to cancel without losing what I've already paid for. Is there an ETF since I'm not on a contract? Are there any fees for ending my service?