The problem isn't that they charge in 200KB blocks. It's that they charge you for a 200KB block before you've actually used 200KB - that is, all usage is rounded up. So indeed, their stated per-MB rates are deceiptful; it ends up being far more expensive in real world usage. Whereas PTel, with an ostensibly higher per-MB rate, comes out much cheaper, because even though they charge every 100K, they don't actually charge it until you really have used a full 100K. The iPhone apparently drops its WiFi connection when asleep, so those background notications may still use data, but tiny amounts of it. I tend to be around WiFi most of the time, but typically may be out a few hours without it. On my iPhone 5, I fnd my data charges with PTel to be on the order of 5-10 cents per day if I am not actively surfing the web or whatever - just background notifications and maybe occassionally checking email.
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