My friend told me about this app (Tikl touch to talk). It allows you to talk to other Android devices like Nextel. It uses your data it doesn't cost any minutes. Just make sure you have unlimited data. Try it out its really cool.
http://market.android.com/search?q=pname:mobi.androidcloud.app.ptt.client
http://market.android.com/search?q=pname:mobi.androidcloud.app.ptt.client
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