To make and receive phone calls on the iPod I use the ZTE MF-60 MiFi and the 3CX app configured for a Draytel VIOP account. Calls to the US from the UK typically cost about 1 penny per minute or about 1.5 cents PAYG. Calls from the UK to the UK are actually more expensive. Draytel also offers a PC application for free secure encrypted voice comms to other Draytel users using the same application if required.
I am in the US and make calls to, and receive calls from, Eastern Europe using Skype (no affiliation) in voice only mode, using both desktop and mobile versions of Skype at no charge. Skype (at least for the moment) allows free international, including mobile to mobile (if both have Skype on their smartphone) international calls. NOTE; don't use video, just voice; most mobile (and few home internet connections) can handle the video, but voice only works fine. My relatives use Skype frequently for their international calls---pretty much have dumped the traditional phone system. Internet access is the key, and, as pointed out, there are many free internet (via wifi) access points.
The times they are a changin. . .
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