Quoting their post directly:

Note that [dest] is the number you want to forward to (eg +12025551234) and [sec] is the number of seconds to let the phone ring before forwarding (in the no answer case). [sec] can range from 5-30 in 5 second increments.

Forward All:
Activate: *21*[dest]*11#
Cancel & Retain: #21*11#
Re-establish: *21*11#
Cancel & Forget: ##21*11#
Status: *#21*11#

If Busy:
Activate: *67*[dest]*11#
Cancel & Retain: #67*11#
Re-establish: *67*11#
Cancel & Forget: ##67*11#
Status: *#67*11#

if no answer:
Activate: *61*[dest]*11*[sec]#
Cancel & Retain: #61*11#
Re-establish: *61*11#
Cancel & Forget: ##61*11#
Status: *#61*11#

If Unreachable:
Activate: *62*[dest]*11#
Cancel & Retain: #62*11#
Re-establish: *62*11#
Cancel & Forget: ##62*11#
Status: *#62*11#

While testing, I found that the activate code works as expected (15 seconds seems about right for me), and the Cancel & Retain codes brought it right back to using the iPhone visual voicemail.

I followed the instructions to activate all of these features accept ‘Forward all’ because if you do that then your phone doesn’t ring, and all I want is to send missed/ignored/declined/unanswered calls to Google Voice rather than AT&T.

In order I dialed the following:
Dial *61*[dest]*11*30# and hit send.
Dial *62*[dest]*11# and hit send.
Dial *67*[dest]*11# and hit send.

Thanks to an article about Call Forwarding on Wikipedia, I found a much shorter way to do all that.

*004*[phone number]#

I replaced [phone number] with the number 1 and then my 10 digit Google Voice number, like so; *004*12223334444#

The nice thing is Google Voice sends me an email and sms message when someone leaves me a voicemail, so I am notified and can check it right away.

Feel free to call or text me at +1 (775) 393-9397

Over the next few days or weeks or whatever, I will decide how comfortable I am using it for different features. The more I like it, the more I am likely to straight up deactivate other services in favor of replacing them with Google Voice.

One thing is for sure already, I have every intention of using this as my primary phone number and will be making my best effort to remove any other phone numbers associated with me from any place I am able. I am even mildly considering changing my cell number and never giving it out for any purpose whatsoever, in favor of the Google Voice number (although that is unlikely to happen any time soon).

Also, since I am an iPhone user, my decisions about how usable Google Voice is for me will probably be affected by whether or not I find a decent app (whether through the Apps Store or Cydia) to make the transition easier.

Anyone who has not yet signed up for a Google Voice invite should visit their invitation website: https://services.google.com/fb/forms/googlevoiceinvite/

On another note, I recommend visiting and registering at https://donotcall.gov/ which hopefully would stop phone spam (like telemarketers) from calling your number.

What shouldn’t I update?
If an update for your device OR for iTunes comes out DO NOT UPDATE.
Let me repeat;
DO NOT UPDATE ITUNES ON YOUR COMPUTER!
DO NOT UPDATE THE FIRMWARE ON YOUR IPHONE/IPOD TOUCH!
Updating iTunes may prevent your device from syncing.
Updating your device will un-jailbreak and re-lock your device! If you are not on AT&T and you update your firmware you will NOT be able to use your iPhone.

What can I update?
You can and should update packages in Cydia, or apps from the apps store.

Can I restore from a backup?
No. Even if you back up the device after it has been jailbroken or unlocked you CAN NOT restore. If you do your device will no longer be jailbroken or unlocked.

What if I accidentally undo the jailbreak or unlock somehow?
If you are comfortable doing it yourself I can guide you through it. Otherwise I would advise you come back to me to have your device set up again.

What is Cydia?
Cydia is a package installer. It allows you to add software that Apple did not approve to your iPhone. You should open Cydia periodically (once a week or so) and allow it to check for updates. If an option to upgrade “Complete” or “Essential” is presented it is best to select “Complete”.
Otherwise, aside from themes, Cydia has some pretty advanced stuff inside that you more than likely don’t need.

What is Winterboard?
This is where you turn themes on and off.

How do I get/use themes?
To get themes, open Cydia, tap the Sections tab, scroll through the list to find entries that look like “Themes (battery)” or “Themes (keyboard)” and then browse through those lists for the theme you want. Once you have found the theme there should be an install button in the top corner.
To turn a theme on after installing it open Winterboard, find your theme, tap it (this will add a check next to it’s name), then press the home button. Your phone will respring, which is kind of like rebooting.

There may be more to this guide in the future, but this should cover the important basics.

TweetDeck Pros:

• The iPhone app seems to do everything that the desktop app does.
• It has functionality for groups.
• It’s speed is impressive.
• It shows a little API usage counter for those interested.
• I’ts free.

TweetDeck Cons:

• The interface does not feel native to the iPhone.
• It is difficult to navigate around certain aspects of Twitter (some may argue but I dislike how it handles profiles).
• By default it is missing the ‘nearby’ feature that many other Twitter apps are sporting already (I know it can be added via search query, but I would imagine the average user would not know how to do it).
• In order to search you have to add a column (Which I find rather irritating).
• There does not seem to be a way to view trends.
• Shake to Refresh is for morons.

Tweetie Pros:

• The iPhone app has an nearly identical desktop app for the Mac.
• The speed makes most other Twitter apps look bad.
• The interface was made to work perfectly on the iPhone.
• All the features you would expect from a mobile Twitter app (and more) are included (nearby, trends, search).
• Searching for tweets or users is a breeze.
• Profiles are extremely comfortable to view and follow/unfollow.

Tweetie Cons:

• It does not have groups (I personally dont understand the need for groups, but it guess it counts as a missing feature).
• If you’re a massive tweeter/tweet-checker you will have no idea when you’re close to the hourly API limit.
• Version 1.3.1 of the app on firmware 3.0 seems to only display one nearby or search entry at a time (have to press load more to get one more each time – never had a problem before). [EDIT]This was caused by the Twitpocalypse and has been fixed in version 1.3.2[/EDIT]
• There is a one time $3 fee to purchase the app (which I think is fair asking for this app).

In the end this is just my opinion, and some of my statements above may be untrue based on lack of knowledge on my part, but that’s how I see it.

I’ll stick with Tweetie.

I’ve done so much setup in the past two days it’s ridiculous.

On the up side nobody can yell at me for always playing with my iPhone now because I play with mine less than they play with theirs at this point.

Also everyone now has twitter (names are linked). Most had it a while ago, Alex actually had it before me (everyone else after me though)