HTC Thunderbolt test menu exposes missing 4G / 3G switch
As we mentioned in our recent HTC Thunderbolt review, there's no option provided in the settings to switch off 4G (LTE) and force the phone to operate solely on 3G (EV-DO). Obviously this is an issue when conserving battery is more important than reaping the benefits of LTE's ludicrous data speeds. Fortunately, we can thank the good old *#*#4636#*#* test menu for remedying this odd deficiency. This hidden menu, which became popular with the Nexus One and is available on most Android devices, allows you to enable / disable radio modes. On the Thunderbolt it lets you select between LTE+EV-DO, EV-DO only, and LTE only. Now you can have your cake and eat it too -- well almost. Follow the source link for step-by-step instructions.
