VoIP has changed the way people communicate across the world. Now one doesn't have to pay hefty money to their service provider to make international calls. All you need is an internet connection and a proper Voice Over IP (VoIP) application/software and you are good to go.
If you are looking for iPhone's feature minus the huge monthly bill, you might want to consider buying an iPod touch. iPod touch has everything an iPhone as except the phone features but thanks to TruePhone VoIP application, you can now turn your iPod touch into a regular iPhone. You might ask "what about the iPod touch microphone?"
iPod touch 2G has a headphone jack that can be used with the headphone that has a microphone. There are plenty of other iPod touch mic out there that you can buy such as iTalk and Griffin Microphone. If you want you can also Create Your Own iPod Touch Microphone.
The new Truphone for the iPod Touch application works on the 2nd generation iPod Touch and enables you to make free calls to other Truphone or Google Talk users from any Wi-Fi zone, using your iPod Touch's internet connection and a headphone with mic, or mic adapter
Now if you combine this truephone with other VoIP or SIP, you can actually make free calls to almost any VoIP or SIP phones.
Check out this truephone video below for iPod touch.
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