Calls:
Blau: rates. [ Last accessed on March 31st 2015 ]
CoopMobile: free SMS, rates. [ Last accessed on March 31st 2015 ]
Fring: free talk, text & video calls (rates). [ Last accessed on August 22nd 2014 ]
Google Voice: rates. [ Last accessed on September 15 2014 ]
Viber: free calls, text and picture sharing with anyone, anywhere! (rates) [ Last accessed on September 15th 2014 ]
