How exactly does the "sending to phone number" work? Does the other party also have to use your app and have linked their phone number to their addresses?
Is your code open source? It says it is on your website (
https://moneypipe.com/hd-wallet) under the FAQ section at the bottom, but I cannot find a link to a GitHub repository.
Yes, the user you want to send the coins to would need to have the app installed on his phone as well. Those of your contacts that have the app installed will appear in Settings -> Address book (as long as they have the "Show me in contacts" option enabled).
We are planning to make the app's source code public in a few version updates - we still need to give it a good polish.