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]

I mean, I turned on the iphone bluetooth, it was continuously searching and can not list the device. I will try "lightblue" to see if it helps, but even it works, does it support other application, such as Nordic's demo nrf_Uart app?