I managed to get a stable enough Internet connection on 3G to check to see that the mumble server is running and it is, so if you're unfamiliar with mumble, here's the process.
You can download the mumble client here:
http://mumble.sourceforge.net/Once you have it downloaded and installed, connection>new should get you to this:

Enter the server information as you see there (label it whatever you want).
Supply your own username and password. The server does not care the first time you sign in but each subsequent sign in will require this information.
You can then press connect to connect.
Once you are connected to the server, pull the Self menu down to Register so that your username and password are secured for life.
Editor's Note: I highly suggest you configure push to talk if for nothing more than the sanity of the people who don't want to hear you chewing or breathing into your mic. You can do this by going configure>settings> Under transmission change it to push to talk. And then you can configure the push button by going configure>settings>shortcuts> press add, click the 'unassigned' option that shows up, change to push to talk, press the short cut area, press the key you want to use as your push to talk button.