Call  any mobile in world for free for unlimited minutes unlimited times
What all you will need:
Google ID
Hotshield
Rebtel Account
IPKall  number
SIP Call number
Express Talk
Headphone with Microphone
Step1:  Most probably you must have got a Google Voice Invite, but if you  have not done it yet, then request an invite, and once you receive the  invitation then proceed for Step 2. 
 Click Here to request an invite 
Step3:  Once you obtained the free SIP number from TPAD, go to the  following website 
http://phone.ipkall.com/
Signup to this  website and write the following during the signup form:
1. Choose your  account type:  select SIP
2. Choose area code for your IP call number:   default 253
3. SIP Phone number:  your TPAD SIP number here.
4. SIP Proxy  number:  sip.tpad.com
5. email address:  your email address here
6.  password: anything combination of words and number
7. Enter captcha image two  words in the box.
 
Step4: Check your email, you must have a  Washington State's free phone number for your IP phone.  Note that number at  some notepad or keep it handy.
Step5:  Now download Express Talk and set up your SIP information as per  the instrutions below:
How to Install the Express Talk  Softphone
How to setup Tpad on the easy to use Express Talk Softphone  (Basic Edition).
This is a very good softphone and very simple to setup  and has a number of great wizards (audio / network).
Also, use this if you  are getting Timeout / Failed to connect / One way audio problems.
How to  setup Free Express Talk Softphone (Basic Edition) with Tpad
1. Download  from 
http://www.nch.com.au/talk/index.html  (Basic Edition)
(Compatible with Windows 98/ME/2000/XP/2003/Vista or  later)
2. Install and follow simple setup guides.
3. When this screen appears, select "Yes, I already have  SIP Account" and then NEXT.
  4. Then when this screen appears enter
Your Name: Enter you display name 
SIP Account Number: Your 7 digit Tpad Number e.g 1126789
SIP Server:  sipx.tpad.com
SIP Password: Your Tpad Password (used when you made an  account)
Then click FINISH.
How to make Free Tpad to Tpad (IP to IP /  VoIP to VoIP)
 Just  dial the 7 digit Tpad Number of your friend, anywhere in the World and press the  Green Call Button.
Attach  your microphone and headset with your computer and make the free call to 121 to  test your setup is working fine.
Step6:  Install  Hotshield to protect your IP address, to download hotspot shield go to the  following link  
http://www.anchorfree.com/downloads/hotspot-shield/ and  install it.
Step7:  Now go to your Google Voice invitation, and set up  your account to obtain a Google Voice Number, when asked for a local telephone  number to receive the verification call, then provide your IPKall Washington  local number, and click Call Me Now.
You will receive a call on your  computer at Express Talk, receive the call and enter the two digit code to  verify your number, thats great now you have activated your Google Voice Account  Congratulation. Note down your google voice number
 
Step8:  Now the final step to make international calls for free, go and  signup to Rebtel 
https://www.rebtel.com/en/Utility-Pages/Join-flow/Join/
Enter  the following in the form:
First Name:  Your name
Second Name: Your last name
email:  Your email
Country:  USA
your phone number: Enter your Google Voice number enter +1 for america's code
chose pin:  enter any 4 digit  numerical number
Step9: Now add any of your friends mobile number  in your Rebtel account to get a local number of washington.  Did not got me,  look what Rebtel does is provide you a local number of washington in place of  any international number, so that when users call local number, they get to talk  to international numbers at cost of local numbers, and calling local numbers of  washington is free via Google Voice, so when you make a call via google voice to  the local number (which is your friend's international number) you get to talk  to your friends for free.  Now add your friend's number with internatioal code  ie. +919xxxxxxx and obtain and note the local number that should be like  7xxxxx.
 
Step10:  Add this local number in the contact of your Google Voice and  click the call button, you will receive an incoming call at Express Talk,  receive the call, then you will here the dialing ring to your friend, when your  friend receives the call, then you are up and ready to call him.
Note:   Do not misuse this service, just think of it as a mean to be in connect with  your loved ones and enjoy the free call.
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Note: Before you try it, let me make you aware, that setting up this system is  going to be tough, and those with high level patience are requested to try it,  otherwise do not try this.  I started setting it up at 10pm night and finished  setting up at 6:30 am morning, so your patience would be highly appreciated.   Share this method with your friends and family who have that much of patience.