This has never been a feature of iphone or ipad.
Bluetooth is supported for stereo headsets/speakers, handsfree telephone devices/headsets, some peer-to-peer apps from the app store, some keybpards, and internet tethering where provided by the carrier.
Other than this it will not connect to any other phone/device/computer.
Ok, thanks for this. The options you give are all outward going signal protocols and I have successfully paired the iPhone with a Dell laptop for file transfer. I haven't needed to send files from Dell to iPhone but perhaps should go ahead and try it with a view to using the Dell as a proxy between the two i devices.
"and I have successfully paired the iPhone with a Dell laptop for file transfer"
This is not a feature of legit iphones.
File transfer via bluetooth has never been a feature of any legit iphone/ipad.