Yolla is #10 in Top 10 VoIP services
Yolla allows to make cheaper international calls to any mobile or landline phone
Positions in ratings
#10 in Top 10 VoIP services
Alternatives
The best alternatives to Yolla are: Skype, Rebtel, Talk360, Boss Revolution
See also:
Top 10 VoIP services
Top 10 VoIP services