I have a family share plan, and my main account contract ends 3/14/11 while my husband's (the second line) ends 9/12/11 - neither are advanced devices. I'm switching from Verizon in March; I know I'll incur ETFs for ending the second line contract early, but what day is best to terminate for my main line? I know it has to be after the contract end date but before the next billing cycle. So if I terminate on 3/15, will I get charged for the entire next month?