The apple iPhone app, Truphone is now juiced up with two new features. The first one allows you to call international destinations on very cheap rates via GSM, without having your Wi-fi turned on as you previously needed. This means that you just need to pay for your GSM network connection, and the rest of the call uses VoIP. The second one is my personal favorite which allows the iPhone truphone users to make FREE calls between each other and also indicate their presence via the app.
Along with that the company has also released a slick app which turns your iPod touch into a cellphone
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