1st of all, there is a free app listed under "LTE OnOFF - HTCThunderbolt"...it works: https://market.android.com/details?id=net.andirc.lteonfoff&feature=search_result
Once you open on it, scroll down to: "Set preferred network type" > click on drop down menu just below - 4G is "GSM/CDMA auto (PRL)" by default...choose "CDMA auto (PRL)" for 3G.
You can also create one using the free app "Anycut": https://market.android.com/details?id=com.appdroid.anycut&feature=search_result
Once open, go to > New Shortcut > Activity > [scroll down, may look blank] until you see "Phone Info" > RENAME from "Phone Info" to "4g/3g Toggle" (or whatever you want to call it) > click OK. It will be on your Homescreen. Once you open it (on your homescreen), scroll down to: "Set preferred network type" > click on drop down menu just below - 4G is "GSM/CDMA auto (PRL)" by default...choose "CDMA auto (PRL)" for 3G.
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