IoTize TapNLink Primer-NBW offers a quick and easy way to add a WiFi (ESP32), BLE or NFC wireless channel that connects your Arduino board to iOS/iPhone and Android mobiles.
The highlights:
- Requires only two wire connections and a power supply from your Arduino
- ArdTap library is integrated in Arduino IDE, so there's no code to write
- Just needs to be configured for your Arduino
- IoTize Studio configuration software automatically generates an Android (APK) app for you!

The TapNLink tutorial shows you exactly how to add TapNLink to your Arduino:
You can get TapNLink Primer from these official suppliers: