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I picked up a WiFi ELM327 adapter thinking I would use it with a spare Android phone I have laying around, but I changed my mind and decided I want to use my iPhone so I picked up at Bluetooth one also. I would take $20 + shipping if anyone wants the WiFi one.
Bluetooth won't work with the iphone unless you're jailbroken and have an app called roqbt4.
Then you need program that allows you to assign the address of your adapter.
Only one I've found that works reliably is dashcommand. That's 60 bucks for just the program IIRC......