By advising with our colleagues, researching and understanding Twilio documentation even better we
quickly overcame all the challenges. SMS verification proved to be an easy job for Call-recorder mobile
app, while the most intriguing part of app development was enabling the reproduction of recorded calls
on mobile devices and auto-renewable In-App Purchases.
Researching the best UI/UX practices for this iOS mobile app, we decided to implement informative and
simple tutorials for our users. Apple documentation on audio and video library helped us get an insight
into how to create the best possible audio player for recording audio reproduction.