Tomorrow's (Sat 15 Aug) Launch, page-15

Low bandwidth is the key advantage as it is not just saving data usage but also increasing calling quality like no dropouts.
Plus cheap call rates, will potentially make ZipT as one of the leading VoIP apps.

What I've observed two key mangers have been treating zip as their own business and not willing to spend money too quickly. They have been working so hard per my correspondence with them. That's a good management team.

I personally prefer them to accelerate spending money on developing like get video call and other platforms out as soon as possible. Fast track will gain market share quickly.
One of determining factors for a startup tech to succeed, is timing. Time is more valuable than cash sometimes.