How to set up notification for incoming calls on android phone?
Dingtone needs to stay in the background to receive incoming calls and messages. Please do not terminate the Dingtone app after you close it. Some third-party battery-saving/memory-saving apps may terminate Dingtone. Please add Dingtone to their whitelist.
Please also make sure notification is enabled for Dingtone. Enter your Android phone's Settings > Application Manager, find Dingtone, enter App Info screen for Dingtone, and make sure "Show notifications" option is ON.