Quote:
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


The costs I quoted for are to call landline numbers (non VOIP) in the UK and the USA. Free calls are also available if both ends of the call are using Draytel VIOP configured clients.

The main problem for the smartphone handset using VOiP is that many portable smartphone handsets will not allow VOIP clients to work if locked to a specific carrier.