Apple Notification Center Service (ANCS) enables a BLE device to connect to an iOS device and access notifications generated on the iOS device. This can be used to quickly design an accessory such as a smartwatch, which can pair with an iPhone. You can learn how to implement ANCS in this example project that shows how PSoC 4 BLE can be used to implement ANCS. The BLE Pioneer Kit is connected to an iPhone and a UART-based console informs the user of the ongoing activity on the iPhone. Incoming calls (with the caller name) are displayed on the terminal and can be accepted or declined by the user directly from the terminal. The number of missed calls, voicemails and emails is also shown.
For more information on ANCS, refer to the Apple Notification Center Service
Project #022: Apple Notification Center Service (ANCS) Profile