considering their app always have issues, you will never be able to track when you need to. They have some of the most incompetent programmers in the country.
The same for that doctor apple stores. Why should a replacement screen for a iPhone 6s costs R3500 at these daylight robbery stores, while in the US a geniune screen costs $150. If you rip your customers off then you deserve to closedown
I've been using Switchtel from the start. I've tested many providers and there is no one better. They understand VOIP, and the industry! You won't make a mistake going with them.
As with all VOIP providers, they key does remain with your ISP. If you internet is weak your VOIP quality will be weak.