Sprint Evo Phone apps for VOIP

I just received my Sprint EVO phone and I wanted to know if google has an application that I can use for dailing or receiving calls.  This way I can lower my plan and save some money.  

In general, I'd like for it to be a Google app, but It's alright if it's not a google app for VOIP.  

Lastly, since I have unlimited data plan, I'm assuming that I won't have to pay for the minutes on the VOIP, is this correct?
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RedLondonConnect With a Mentor Commented:
I'm using Sipdroid ( http://sipdroid.org/ ) with my Sipgate VoIP account.

Making calls isn't free with Sipgate but it's much cheaper than off-plan calls over the mobile network.

You're correct in that you can use VoIP using a data connection and that would be considered data by the mobile network and not deduct (or even register as using) voice minutes from your calling plan.  You may have agreed, as part of your terms and conditions, though, not to use VoIP.  Most mobile contracts in the UK say you can't use VoIP, but in my experience they have not done anything to stop it... certainly Sipdroid works well.

I use Sipgate's UK service because I'm in the UK, but they have a US service - see http://www.sipgate.com/one - it is free to hold an account but you'll need to buy some credit (without future obligation to buy more) to make calls.

Once you have a) installed Sipdroid from the Android Market, and b) opened an account with Sipgate, then c) follow the screenshot steps at http://www.hutsby.net/2010/03/how-to-sipgate-and-sipdroid.html to configure the Sipdroid application with your Sipgate account details.

If you prefer, you can tell Sipdroid to handle outbound phone calls by default (ie make all calls via VoIP) and seperately you can tell it to connect only when you have a wifi connection, only when you have a 3G data connection, both, neither etc.
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