I am trying to figure out a way/service that allows me to call out from our business phone number, from my iPhone. Can anyone help?

I would say simply: a patience. Build the momentum much before the release, months or years. Release when people rave about your app.

Ultimately, it depends on the value the app has for the buyer (not how much money you put into developing it). Unfortunately there are many reasons for a buyer to purchase an app and so there are many ways to value an app (a multiple of yearly revenues,number of active users, etc.) . A good solution to this problem is to post your app on an auction site such as http://www.apptopia.com/ and let the marketplace give you an answer. Good luck with your sale.

Hi, check outmy response to another question similar to yours. I hope it helps. Overall what you need to do is grow your community of users, or depending on the app generate enough sales or interest typically before any investors considering joining you. Not impossible to get investors early on, but your best bet is through kickstarted if anything. My responses tend to get UpVoted by other experts. Check it out https://clarity.fm/a/8032

NASA is famous for writing the most bug-free code in the history of programming. They do it by being fanatics about test-driven development. They write tests for tests. If you want to have a rock solid app, you have to put everything else aside and focus only on quality. Every time a new build goes out, every single member of the team has to test every tiny nook and cranny and write tests to mimic how they're testing it in real life. The goal is to start small with a solid core and get it functioning error-free before building other features. If you hold yourselves accountable to make feature incredible before you begin building others then you'll never have to go back and clean up something later. In short, try to do it "write" the first time :)

Well, the biggest cost here wouldn't be in the app, but in the server infrastructure. As usual with connected apps, people often forget they have to be connected to servers. The app itself is just a view to what the servers provide, so it's not the major cost. 20K $ to 100K $ should be enough. On server stuff, I expect it to be a lot more, particularly if you aim for a wide audience (several million $). On a Whatsapp clone, I'd consider: - solutions for performing calls through servers, not that easy. Look at what Twilio provides. WebRTC is an upcoming protocol that will ease that (web & mobile). - solutions for API, IM and user accounts management. Look at StackMob or Parse which are MBaaS (Mobile Backend as a Service). Hope it helps!