The Cabify app needs to be sending and receiving quite a lot of information in order to work. If it won’t connect properly, the most likely scenario is that you don’t have a strong internet signal. Try moving to a place with better coverage.
Another reason could be that you’re using an outdated version of the app. Your app should update automatically, but if not you can go to your app store (Play Store on Android and App Store on iOS) and search for Cabify. You should then see the option to update the app.
There may be occasions where technical problems are causing the app to crash. If so, our engineering team will be on the case immediately and should get things working again extremely quickly.