I am a freelancer and often work in cafes or coworking spaces. Is it possible to manage financial transactions on a mobile device while surrounded by people?

It's totally possible, and I've done it many times myself. A simple app that I downloaded here helped me with my financial transactions. It allowed me to transfer my trading to my phone and not worry about where I am. I like that it doesn't require super-powerful Wi-Fi, works on mobile internet without lag, and I can check my positions or close a deal at any time. When coworking spaces are noisy, it's not a problem either, because the interface is intuitive, and I can navigate it almost automatically. Mobility has greatly changed my discipline and speed of work.