As others have said, it has to change to 1x for voice/text. However, mine does switch more than it should have to. I'm sure it's a strain on the battery, especially, if you put your phone in sleep mode while in 1x. From my experience, it will stay in 1x until you wake it up.
Also, recently, I've been noticing my 3g just turning itself off. I have to go toggle it back on when I wake my phone up. Seems sporadic.
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