There are several things that you should consider before starting a call using the WiCall application. Before you start calling, you need to make sure that your Internet connection is stable. It's advised to use a WiFi network for this job. Also, before you start to call, make sure that your device is working properly. You can also go to Settings > Application > All tab > search for the WiCall application, tap on it and select Clear Cache and Clear Data. If you still have problems with your calls, contact the developer on the following mail address for further support: firstname.lastname@example.org.