From eSIM to a complete VoIP experience I have been with this product from the start. It began as...

From eSIM to a complete VoIP experience I have been with this product from the start. It began as...From eSIM to a complete VoIP experience I have been with this product from the start. It began as...

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Volodymyr Serhieiev

• Nov 26

From eSIM to a complete VoIP experience

I have been with this product from the start. It began as an eSIM and data app, and adding VoIP meant fitting a full phone system into an app that was never designed for it.

Users can have unlimited numbers with their own calls, messages, contacts and rates. The structure was complex, so I focused on making the experience feel simple.

Since the app already had many sections, I designed everything to live inside one tab. After many wireframes, I arrived at a layout that keeps navigation clear and effortless.

Users can switch numbers, manage caller ID, check messages and buy new numbers all in one place. The interface feels light while the system behind it is very powerful.