Your phone, phone provider, 3rd party applications, firewall, internet, and more can all impact how well the celitoMobile softphone works for you. This software is provided as-is. celito's troubleshooting of softphone issues that are specific to your setup will be limited. A softphone should never be used as a replacement for a physical phone, especially if phones are a critical part of your business.
celitoMobile Android is a softphone that allows you to make and receive phone calls, modify your answer rules, listen to voicemails, and more on your Android device.
The first troubleshooting step is to verify if the softphone shows "Registered" by checking the Android notification tray