Ads on ZipT App, page-23

This one (still online) is even more specific:

http://zipt.com/blog/7/five-reasons-why-zipt-beats-your-regular-calling-app

Say no to in-app advertisements ​

If there’s something that we really don’t like, it’s seeing a stunningly designed application that’s filled with in-app ads that pop-up from everywhere or take a large portion of the screen when you’re using it. Despite the revenue boost that having in-app ads would have brought, we decided not to implement them within the app itself as ads can be distracting to users and prevent them from using Zipt as it’s meant to be used. Zipt is completely ads-free and will remain that way because, to us, user experience and functionality of the application trump everything else - that’s something that we are not willing to sacrifice.​

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Hard not to agree, it seems a bit desperate and last ditch plonking adds on.. after everything said and done so far!