Google Voice Dialer
What’s GV Dialer?
Why do I need GV Dialer?
I am in US, but I do not have faves number feature (such as T-Mobile faves).
I have an data plan, I want to call USA and Canada for free with Gizmo5/Sipdroid.
GV Dialer will intercept your outgoing call; uses Google Voice to call you back and connect your call for free (in the US).
Unlike the official Voice app, GV Dialer will routes your call through the internet and will not use your minutes.
You can use GV Dialer with Gizmo5/sipdroid; can also use it when not in US.
To use GV Dialer, you need set up a Google Voice account if you don't already have one. As of today, I think this is only possible by requesting an invitation, and you can request an invite. It normally takes 1 - 2 weeks to get it. 
I am in US, but I do not have faves number feature (such as T-Mobile faves).
In this time, if you the official Google Voice application, you will be charged. As the official Voice application will call to a local number (for example 760-576-4664, will change irregularly), and connect to your destination through this local number. If you can not call to this number for free or add this number to your faves, you will still be charged.
You can use GV Dialer to avoid this kind of charge.
Set your Google voice account, and choose the default phone to ring(this is the callback number). 
I have a data plan; I want to call USA and Canada for free with Gizmo5/Sipdroid.
1) Set up a free SIP Gizmo5 account by clicking here. Please note that currently, you have to wait for Google to re-release the Gizmo5 service. Once you have the account, note down your username/password, as well as the 1-747-xxx-xxxx number that Gizmo assigns to you. This number is available on the Gizmo page when you login (https://my.gizmo5.com/).
2) Add and confirm your gizmo 1-747-xxx-xxxx number in Google Voice, and tell Google Voice to forward to this number when it receives calls (important). You must either run Gizmo5's client software, a third party softphone registered to Gizmo5, or Sipdroid registered to Gizmo5 (see step 5 below) in order to receive the confirmation call from Google Voice.
3) Set your gizmo5 number as your default phone to ring in GV Dialer. 
4) Download Sipdroid from the market, and install it on your Android phone. In the "SIP Account Settings" of Sipdroid, enter your Gizmo username and password in the appropriate fields, and proxy01.sipphone.com under "Server". 
5) Now you can call with GV Dialer, the callback will be catch up by Sipdroid and connect your call for free. 
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