Ok - I'm off to the States next week, and want to ensure I'm not charged for, well, anything! On my old phone, I could get email when I demanded it (very slowly). It was free to get texts, and if I never answered my phone, I was charged nothing. I'm on the same plan, but want to make sure my phone does not do ANYthing without my permission. How should I set it to ensure that texts can come through, email is only when I open the app and demand it, phone calls can come through or be rejected, but EVERYthing else is off?