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For SIP to SIP, that is always free.
I'm using Ekiga for that.
Use a soft phone to dial sip users as a user name is used instead of a phone number that can be dialed on a plain telephone. An ATA can be used to receive calls from SIP to SIP or from a provisioner. You can get a free SIP account from Ekiga https://www.ekiga.net/

For free inbound with a local Washington State USA number, IPKall is completely free. You can use this number worldwide. For example if you live in Australia, you can have a US number for people to call you.
http://www.ipkall.com/

For outbound calls there are a variety of low rate and unlimited plans. I'm using Lingo.
https://www.lingo.com/

All of the above can be used with an ATA adaptor that is not locked to a carrier such as Vontage.

For Android, IMHO better options already exist.
Get Sipdroid + any SIP provider like CallWithUs, justvoip (+ IPKall as DID) etc.
Look Ma, calls over 3G to many countries for free or cheaper than big-brother-Google.

... Thanks to my choice (VoIP + WiFi on my "smart" linux enabled (maemo) hand set) my total cost of ownership (TCO) is less than $100 per year. ... $24 per year for SkhypeIn (with SkhypePro) + $3.00 per month for unlimited calling...

Huh, if all you need is calling while next to a WiFi hotspot, "less than $100/y" remains way overpriced IMHO.
I use VoIP from my cellphone for maybe $10 to $20/y with SIPdroid + IPkall DID + JustVoip (or others) + optional: Asterisk, SIPBroker and E164. But all this is mostly irrelevant as my reason for having a cell is to call from places other than home or work = often without WiFi.

Back on topic: VMware stuff is IMO like that VoIP/WiFi stuff: sure cool, appealing to geeks. Good for PR / publicity. But otherwise limited practical usefulness, esp for non-techies...

A quick search revealed a bunch of companies. Here are some:
http://sipnumber.com/
http://www.ipkall.com/
http://www.freedigits.com/

Those are free services. The last one seems to have problems, though.
Paid services exist, too. Just google it :)

There are times when I just want to send a voicemail home without ringing the phone -- often because it's late and I don't want to wake anyone up. Since I'm already running Asterisk, I just registered a DID with IPKall, which is a free service. When I dial the IPKall number, it goes straight into voicemail. So if, for example, my wife wakes up in the middle of the night and sees the VM light on the phone blinking, she can push the button and find out that I'm stuck at work on an overnight project, or whatever. If, on the other hand, the purpose of my call is important enough to wake someone up at home, I dial the main number and the phones ring.

To -make- calls, if you have no other option, the GrandCentral web system (http://m.grandcentral.com/) is a bit clunky, but OK for residents of FreedomLand.

(I signed up long before the Google acquisition; my number still works after a LONG period of inactivity)

IPKall takes away your number if you don't use it for a few weeks.

http://www.freeworlddialup.com/ Gives anyone a free phone number forever, globally, and you can dial to and from most VOIP services.

It works great with any VOIP SW or HW or Asterisk for a fancy home answering machine.

If you need the POTS (Plain Old Telephone Service) world to call you, http://www.ipkall.com/ will give you a free Washington phone nuumber.

Furikup is a beta quality SIP client for the PSP. It's always nice to see the increasing number of devices supporting SIP. Without the luxury of having a PSP to play with Furikup, but having another SIP device (Nokia E61) I can give some recommendations to new users Voice-over-IP (VoIP).

There are a number of free incoming number DID providers. A few examples:

SipNumber provides Iowa State numbers.
IPKall provides Washington State Numbers.
OrbTalk provides London geographic numbers.

Google's Recent acquisition of GrandCentral is a very tempting prospect even though it is not a true SIP provider. You can get a phone number in almost any locale with GrandCentral and forward the number to the above two US-based providers. You may almost register for a Gizmo account and forward directly to it through GrandCentral. Once the Gizmo SIP account is registered to your device it'll ring when called from a regular landline.

The problem with having this many accounts is finding a service which can aggregate your numbers in one place so you don't have dozens of SIP accounts to register in your device. Voxalot is a nice service but they charge $15/year. Another one is PBXES.org but I would stay away from them. They have a notorious reputation of locking accounts and demanding a 50 Euro ransom to regain access. My personal favorite is MySipSwitch. It's free, does SIP aggregation, and allows simple dial-plans to maximize cheap calling over SIP. It's also an open-source project and the developers directly answer questions from the community in the forums.

Coupling this with services like PhoneGnome, it's possible receive calls from all over the world with some very simple guides (link #1, link #2) out there. Go ahead and give it a try. A big congrats to the coders that are bringing SIP functionality to the PSP.

I was thinking about the same thing. The information that would need to change are the following:

Name
Phone
Email
Address

Some information is obviously changable. Provide a different email address (tons of free ones and you can probably find one that'll forward to your existing account).

Phone number isn't that hard either. You wouldn't want to give employers your cell phone # anyway, but there's plenty of free voicemail online service which also provide a number. http://www.ipkall.com/ is one that I use for VoIP and if I don't answer, it emails me a wav file of the message received. After you confirmed you want to speak them, you can then update them with your real cell phone # or home #.

Address is a bit hard, but if you're willing to shell out a few bucks a month, you can open a P.O. box at your local Post Office or even at your regular UPS Store.

The name is always the tricky one. I would say if you could, give them a nickname. or a few typos in your name might help.

I prefer FreeWorld Dialup as a great way to go for voip:
 
- standards based
- Free
- Windows , Linux and pocketpc clients available
- Call 800 numbers and more
- Call to/from vonage customers
- get free phone number and have people call you
- Get a wisip phone (WiFi SIP) and you have the closest thing to a IP mobile phone you can get.
 
  FreeWorld Dialup

If you use sipgate (http://www.sipgate.co.uk/) you can sign up for just about any area code in the UK. You can choose any area you want when it asks you for your "area code of residence" and your billing address can be somewhere else.

You can also get a free US number to forward to any SIP phone from http://www.ipkall.com/

As someone else mentioned - FreeWorld Dialup is a great way to go for voip:

- standards based
- Free
- Windows, Linux and pocketpc clients available
- Call 800 numbers and more
- Call to/from vonage customers
- get free phone number and have people call you
- Get a wisip phone (WiFi SIP) and you have the closest thing to a IP mobile phone you can get.

FreeWorld Dialup

I'm currently running windows and ipaq (pocketpc 2002) clients fine. And calling my home vonage service - no problem!