I've been using krispcall for my business second number and for my personal number as well.
I've been using krispcall for my business second number and for my personal number as well. I like this service as i can have both business and personal phone in a single device and manage without any hassel. i love the fact that i can use these numbers with Whatsapp and viber. The interface is simple and it provided me with a lot of features that i needed, especially IVR which helped me easily manage incoming calls. One thing they need to work on is their IOS app as it's sometime a bit glitchy. But i like the fact that their customer support is super responsive whenever i had some problems or questions.