Your Smartphone needs to have support of Bluetooth Low Energy (BT4.0). This depends on the Smartphone Manufacturer.
- For Android, Bluetooth Smart was introduced in version 4.3 (API level 18) so if you have Android 4.3, or newer installed on your device then you should have the necessary support for it in your OS.
- For Apple, all iPhones (6 Plus, 6, 5s, 5c, 5 & 4s) are supported.
You can google it or check your device here.