I got a call from Saka but did not get a notification from mobile apps. Why can it happen?

Usually, this will happen when the device does not have an internet connection (GPRS). For example, you park the motorcycle in the basement. However, you will still get calls from the device because the device still has a GSM signal to make calls to your phone. GSM: to make calls and send SMS. GPRS: to send data over the internet. I hope this info is helpful for you.