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?

thanks in advance
Thanks for every one who answer my question.

what i really need is a prepaid plans for mobile VOIP calls.

thanks again.

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