Mossberg:
However, the data speeds I got in my tests weren’t spectacular, or anywhere close to the typical maximum Sprint claims, even in Baltimore, where the company’s 4G network is mature. And, when using 4G, the EVO’s battery runs down alarmingly fast. In my tests, it didn’t last through a full day with 4G turned on. The carrier, in fact, is thinking of advising users to turn off the 4G network access when they don’t think they need it, to save battery life. This undercuts the whole idea of faster cellular speeds.
This is the same as Google telling people to turn off the features that they bought the phone for to save battery life. It is stupid – this is clearly the reason so many people evangelize the iPhone. Imagine if Apple was telling users to do something like this, they would be slaughtered in the media. So should Sprint.