[Droid Incredible Q&A, Help & Troubleshooting] fezzik77:
Mostly curiosity and I am not sure I changed all of these some I am pretty sure I looked up and left alone but I will try to explain.

EVRC-B on all - EVRC is probably fine on this phone but it was all important on the Droid to change this to B or 13K. EVRC-B isn't universally supported yet but it is just a newer vocal compression protocol that can improve voice quality or at least sound better on some modern equipment. Really 13K is fine for me but I questioned it's battery effect and real world benefit. Essentially 13K is Disabled EVRC it is much less compressed. It was developed early in Digital Cellular because a lot of people didn't trust the other standard which I think was actually even before EVRC.

Slot Cycle Index 1 - A slot cycle is approximately 1.28 seconds. By default most phones are set to Solot Cycle Index 2 which is 3.84 seconds, 0 is 1.28. What this does is it is a setting built into both the towers and phones as to how often they broadcast or listen for a page. If someone is calling you the request hits the tower and it waits until the next slot in its cycle index to send a page to your device. Your device listens based on its setting. Most towers are set to 1 most phones are set to 2 so the page could go out twice before your phone notices it is there. It decreases battery very slightly setting it to 0 even makes a very slight difference since it is a matter of milliseconds that it takes to wake up the receiver and check if there is a page out there. Since the towers are set to 1 it seemed superflous to set it to 0.

HDR Hybrid Preferred Enable - Not sure I actually changed this but I looked it up once. I believe it has to do with the way 1x opperates with data but I can't for the life of me remember. I am sure I looked it up and if I changed it I did it because of what I read and if I didn't it was either because I didn't find enough useful information to make a decision or I found that this was already good.

Rev A Enable - for some reason mine wasn't and that was one of the selling points of the device. Rev A has to do with data. I believe it refers to 3G but again don't remember everything off the top of my head.

1X Diversity RDDS - didn't find much about this. It is default set to disable but I found very limited information abut this. One thing mostly referred to radio DDS and how it did all this amazing stuff like improve data (mostly in LTE networks but there was benefit to building on CDMA) and battery life and all kinds of things. So I thought I would try it out and see if I saw any effects at all.

Dormant Handoff Optimization Enable - Dormant handoff has to do with the way you are passed from tower to tower. There are a few ways to do that. I figured optimization should be enabled. It happens so it might as well use whatever protocol they chose to make that work better. Not sure if or what it does. I figured it would help me with the few spots of dropped calls. I read about what several of them do and figured it has to be better than not doing anything.

Took the DUN out of the M.IP profile - this was a tip I have seen in several places about loging in to certain data features. Might be useful might not but and may or may not do what they say. Apparently for some people it allows you to use the built in tethering programs without setting up the feature with Verizon like you normally would. You do this and download the drivers. I basically just did it so that I wouldn't accidentally or that no one that might be using my phone might accidentally sign me up for something I can't afford to pay for. This way in theory if they do it and it works I don't have to pay anything just fuss at them for doing it and if it doesn't no harm. But it seems like it would be way too easy to accidentally sign up for $20 tethering or for someone that doesn't know better would do it and not tell me. Thinking if it is installed I must have it.

ACCOLC 6 --- Not sure if I changed this or not. I found something about it and can't remember what it does. In fact I am pretty sure this is default because I am not sure I found anything that told me what the settings mean or do for you. I know you can set it from like 0 to more than 14 but I don't know how high.

Voice Privacy Disable - - Again a hold over from Motorola. Voice privacy tends to add a tinny sound for some reason and frankly I don't care if anyone is listening in on my convorsations.

CD ROM disable - - I hook to my computer frequently and I have a Froyo Rom and this is just insanely annoying. It pops up and plays this ad for Verizon and trys to walk you through all this stuff. This is where you shut it off.

Pref_For_RC RC4 - - I have no idea why but mine was originally set to 3. This is a security streaming protocol. RC5 is unstable RC4 is the highest level considered stable currently. There is an RC6 but I don't think it is an option. It is a build out from RC5. Might not do anything if I turned of Voice privacy but it might have more to do with the ciphering settings which is like a data scrambling thing that makes the data hard to intercept which is more important to me.