You may wish to disable LTE/4G on your HTC Thunderbolt if you live in an area that doesn’t have Verizon’s LTE/4G service yet. Doing so may increase performance and save battery life because the device will constantly search for a stronger signal. Here’s how to turn it off.
1. Open the Phone app.
2. From the Phone tab, dial *#*#4636#*#*
3. A test screen will open. Tap Phone information.
4. Scroll down to the Set preferred network type setting and set it to CDMA auto (PRL).
LTE/4G is now disabled and your Thunderbolt will connect to the 3G network. If you ever wish to enable LTE again, you can set the preferred network type setting back to CDMA + LTE/EvDo auto.