User Profile

Which Bluetooth Profiles / services are supported by iOS?I found this:https://support.apple.com/en-us/HT204387I read up the iOS 11.3 will only see the built in pre-defined profiles. Is there a work around?Hands-Free Profile (HFP 1.6)Phone Book Access Profile (PBAP)Advanced Audio Distribution Profile (A2DP)Audio/Video Remote Control Profile (AVRCP 1.4)Personal Area Network Profile (PAN) Human Interface Device Profile (HID)Message Access Profile (MAP)So the Android phones will see the advertising of all kinds of BT / BLE devices, but iPhone does not, unless it was previousely paired by a custom app.Once you "Forget" this device on iPhone, it goes away and will not be seen during scanning.So even a Serial Port dongle with Serial Port Profile is not supported.(SPP), unless it is drive by a custom app?Any help appreciated