Varjak, good evening!
Dear friend, let me try to untangle this whole issue.
The ELM327 is a Bluetooth OBD-II Wireless Transceiver Dongle that you can plug into your car's OBD2 Port to read information from car's computer, engine and other stuff from vehicle.
There is a lot of applications compatible with this device, for Windows, for Android, and some of then for IOS as well.
The first thing you have to do is pair your "bluetooth receiver" (iPhone, iPad, Android Tablet or Phone, Laptop or any other bluetooth computer) to ELM327, then after pairring you will be able to get information from your car do the application.
The fact is neather iPhone nor iPad is able to pair with the ELM327 Bluetooth device.
When you go to, for example, in the iPhone settings, Bluetooth and search for the new bluetooth devices, the ELM327 is not identified at all, and it is not possible to pair. If I take the same steps with my Galaxy 5 Android 2.2 Phone, it imediately recognize the ELM327 device, pair with it, and I'm able collect data from the vehicle using any application compatible with OBD-II protocol.
On Board Diagnostics-OBD-II Protocol is used by most brands of car developers.
The amount of diagnostic information available via OBD has varied widely since the introduction in the early 1980s of on-board vehicle computers, which made OBD possible.
More information about this protocol you can see at: http://en.wikipedia.org/wiki/On-board_diagnostics
More information about ELM327 Bluetooth device can be found at: http://www.amazon.com/Soliport-Bluetooth-OBDII-Diagnostic-Scanner/dp/B004KL0I9I/ ref=pd_sxp_grid_pt_0_2
I hope made myself and other users question clear at this time.
Probably at the end of this, we will find that iPhone, iPad and other IOS devices are not compatible with ELM327 Bluetooth device; and my question will remain open, Why this is happen just with IOS?
Thank you so much for your help.
/Adriano