Bluetooth LE device could be found by android device, but not iphone, why?

[shalongbasi1]

I hava a BLE device which can be found by andrioid 4.4 and 6.0 smartphone, but cannot be found by apple iphone5s iOS 9.3, what could be possible wrong with it?

[shalongbasi1]

thanks, I tried your app nrf_Uart on iphone, and it cannot find the device, nrf_Uart on Android works fine.