I have 2 phones on my account, no tabs. I want to change both plans, but I know that I can only change my plan once in my billing cycle. So, do I have to change one now and wait the next billing cycle to change the plan of the second phone or I can do both now?? And when do I have to do it? The last day of the billing cycle, few days before or the first day of the next cycle? And what will happen if I change like 3 days before the end? Pay more on my actual bill or the plan will really begin the first day of the next cycle? Thanks!