Cheap International Calls Mobile

cheap international calls mobile

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What is the VOIP service provider lowest rates for international calls?

I am using Nymgo service in my mobile, it is offering a very nice cheap VOIP INTERNATIONAL calls from mobile internet calls. But unfortunately I am facing some problems with this service now a days.
so, my question is any body knows other service provider provides a similar service with same rate or even lower?

Vonage 500mins = $17.99/month without fax
RingCentral 1000mins = 24.99/month with internet faxing services.