The iPod touch and iPhone are similar looking devices sharing a number of similar features. However the iPod touch is basically a multimedia device whereas the iPhone is a Smartphone sharing both mobile phone and a multimedia features.

If you are an iPod touch user and you want to make & receive calls on your iPod touch just like an iPhone then here is good news for you. You can use a free application called SIP-VoIP that enables you to transform your iPod touch or your iPhone into a VoIP device and make cheap calls to your friends and family.

Here's is a summary of how you can do this using the SIP-VoIP application.

1. Unlock/Jailbreak your iPod touch or iPhone. Read more on how you can do this here .
2. Get a Touchmod mic for your iPod touch if you haven't already got one.
3. Download the free SIP-VoIP application. Get it here
4. Install SIP-VoIP on your iPod touch or iPhone, and setup a SIP account to make cheap calls. Read more on how you can do this here

fring has also recently launched an iPhone version of its VoIP client that enables you to make cheap VoIP calls on your iPhone. Read more about this here.

Source: Lifehacker.com