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I would only turn off the 4G radio if I was in an area that didn't have it, or I wanted to save a little battery. There are little widgets you can get in the market to turn off the 4G radio, I saw a few for the Thunderbolt.
Originally Posted by irl Panda
And for Skype chat, just compare it to how well it works on other 4G devices and other 3G devices. Obviously 4G-4G is the best, 4G-3G is useless, and 3G-3G is going to be a little less quality, but still works. Depends on the 3G signal you're getting. And WiFi should always work well.