If you don’t know what EVDO or CDMA are, my basic understanding is that they are wireless protocols used to transfer data between cell towers and cell phones. EVDO is the higher-speed, but higher power-consuming option. There are two reasons someone would want to disable EVDO: to save a little battery life, and as one of the steps to getting effectively free Internet on a laptop through their phone.
You know to which infrastructure your phone is connected by a symbol at the top of the screen. "EV" means EVDO, while "1X" means CDMA. (I think the 1 also implies the version of CDMA, but that’s over my head.) By default the phone connects to EVDO if it is available, otherwise it will connect to CDMA. The goal of this tutorial is to make the phone prefer CDMA over EVDO. Doing so shouldn’t have any effect on the performance of calls, though downloads through Get it Now would probably be slower.
So let’s get to it!
First, you need to put your phone in debug mode. This is done by typing "##DEBUG" ("##33284") into the phone as if you were making a call. You have to be quick about it. You know that it worked if the final digit, 4, isn’t displayed. Upon typing "##DEBUG", the phone should look like this:
Now you can get in to the FTS menu. I don’t know what "FTS" stands for, but it allows you to change some settings in the phone that aren’t usually accessible.
To get into the FTS menu, now that you are in debug mode, press "CLR" and then the left soft button. Pressing that combination at any time will get you in and out of the FTS menu. Note that you do not hold "CRL" while pressing the left soft button.
Press the left soft button ("EXIT"). The phone will be unresponsive for about 15 seconds. Eventually the screen will show the FTS screen briefly, display another screen, and then then settle on a final screen. I can only assume this is the phone restarting.
Now you just have to get out of the FTS menu and disable debug mode.
The way you get out of debug mode is the same way you got in. Just type ##DEBUG from the home screen. Make sure that debug mode is disabled by pressing "CLR" and then the left soft button. If you don’t see the FTS screen, you’ve done it right.