With Greydot you actually get money back for making and receiving calls.
A 13min call to MTN cost me R4.20. I was rewarded with 22c back.
A 8min call that I received I earned 14c back.
Greydot is not the best streamlined service but it works really well actually. You get a free 087510 number.
Call Rates are
29c per minute billed per second calls to Telkom mobile, MTN and Vodacom
35c per minute billed per second calls to Cellc
30c to Telkom landline
Free calls Greydot to Greydot
Greydot also allows you to set your cellphone number as the caller ID.
Greydot also allows you to make call backs. That means they call you on your chosen number and then call the other party no VOIP needed. You get charged for each call meaning ~60c per minute when calling like that as it counts as 2 calls.
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The cons obviously is not so streamlined in general. App needs work. Loading money the price excludes vat meaning you will load R50 and you will get credited R50 - Vat. The reason they do that is because I believe the call rate is also excluding vat so you pay the vat up front when recharging.
Server is hosted on the Vox network in JHB meaning 25ms for people in CPT and 15ms for people in DUR but for me in Centurion I get 3-4ms to the server so very good quality.
No support for Opus or HD voice codecs it seems just the general G729, G711 a and u law.
R5 per day/ R150 per month for a DID number like 010,011,012 ect. It was free before but they started charging for it now.
Overall I think they compare favorably to other VOIP offers.
Works really really well on CS Wave (Grandstream wave) Free Android and ios app.