I can confirm that the Cheap ELM 327 Bluetooth type scanner will not connect to my iPhone 5. I've tried all possible settings, but no connection.

It's one of my favorites too, Mike. Recruited here in the late '60s, just out of school, but couldn't handle the high cost and low wages of those times. Came back after a career in Detroit and Chicago, and it'll take a lot to get me out of here again.

Do some setting job
 

I just broke my piggy bank for a new sweet mini elm 327 with switch to play with. cheap $12 and much small previous elm327. Plug it into the vehicle's 16 pin socket, turn on the power, wait for the LEDs illuminates, attach the WIFI community of iOS system, and go to the App’s main program, start your first scan and enjoy seeing your engine’s available parameters like Vehicle speed, PRM, fuel pressure, mass air flow, EVAP System Vapor Pressure, Fuel Consumption,etc. The biggest advantages of this new super mini elm327 is that it comes with a built-in power switch to prevent the need for having to constantly disconnect your unit from the OBDII port.

I have made some comparison and found a cheapest one. Other may cause 10$ more than the price

Super mini ELM327 WiFi with Switch work with iPhone

If it can not be connected with iPhone, I think the reason should be following:
An iPhone cannot be on 2 different wi-fi networks at the same time. To use a wi-fi ODBII adapter with an iPhone and have the internet at the same time, you basically have 2 choices (I think).
1) Figure out a way to put that wi-fi adapter onto your home wi-fi network so the adapter and the internet are on the same wi-fi network. (of course, this will only work when you are at home)
2) Jailbreak your iPhone so you can configure it as a wi-fi "hotspot" (many Android phones can already do this). Then you could configure the adapter to join your iPhone's wi-fi network. Perhaps newer iPhones will include this capability.

I'm curious is one if these wifi dongles and the right iPhone app if I can diagnose or reset srs or three amigos codes. Has anyone done this and with what apps.

Thanks

Eric

You might want to try LELink. It is Bluetooth low energy OBD reader. I have been using it with my iPhone 5 for a while and really like it. Found it from outdoor app site: Outdoor Apps In The Palm Of Your Hand

You can connect an iPhone to a cheap ELM bluetooth dongle. I have one set up and it works awesome. But you can only do it if you jailbreak your phone. That is because you need to install roqyBT4 to unlock the bluetooth to allow it to connect to frequencies other than those in the limited band that apple allows. They claim that they limit it for the good of the user but it seems like it's done to make sure they get paid by whoever wants to connect their devices to an apple.

I have an old iPod touch 4 that is running iOs 6.1.6. I did a jailbreak, then installed roqyBT4 which cost about $10 then I installed EngineLink which cost $5.99. I'm able to monitor coolant temp and real time data for any function that the ECU monitors, plus read and clear codes. I actually found this iPod touch laying in a parking lot so I've got about $28 invested in my scanner. This is a great way to go for anybody with an older device around. As long as it can run iOs 6 it can handle EngineLink. Jailbreaking iOs 7 and up is a little more challenging.