*#*#4636#*#* code does not work.

Anyone able to get the *#*#4636#*#* code to work? I've attempted to us an app called 'Network' which I think takes me to a sub-portion of the menu the above code is supposed to take me to. But I can't get the code to work. Thoughts?

Droid Charge; OS 2.2.1 stock

This combination does not work on Droid Charge. I believe it is only suppose to work for Thunderbolt.

There are 2 options on how to switch between 3G & 4G:
1 You can downlload from the app store "LTE switch" application for free or

2 you can do the switch in Phone's settings:

Go to Settings > Wireless& Network > Mobile Networks > System selection and choose between LTE automatic (4G) or CDMA mode (3G) and you are done