Saw both good and bad feedbacks about 2Talk. It seems cheaper, easier to configure, works on mobile SIP clients, can be registered on multiple devices, and pay-as-you-go without contract. But I'm a little worried about the call quality, as there aren't many people talked about it, neither complain nor praise.
WXC VFX seems have better reputation. But it seems harder (because of the requirement of the separated Auth ID??) to configure on a non-certified device, which I would be using, most likely a software phone on PC + a SIP client on Android. VFX doesn't include any extra minutes like 2talk's national and country minutes, and doesn't seem have the multiple device support, as far as I can talk.
I will be mainly calling NZ numbers, both landlines and mobiles. Could anyone who have been used any of these 2 VOIP provides shared some experience and suggestion please? Thanks very much :D