I recently download an app from The Market on my Samsung Epic (Android OS phone) called Torque. It's an app that works over BT and pairs w/ a wireless OBDII diagnostic reader that only costs $20. I have no idea what the app is called for iPhone's, but supposedly there are similar apps for that OS.
wireless Bluetooth OBDII OBD2 Diagnostic 327 V1.4 B15 - eBay (item 300501424791 end time Dec-09-10 19:40:00 PST) - I purchased mine from this seller, it works great.
There are more expensive BT device, either smaller, corded or whatever, but this one has worked great for me for quick little jobs. I've also used it for real time testing while driving down the road, putting it into heads-up display mode and putting it up on the dash. I don't even remember how I found out about this app, but it's quite cool for being free...I've yet to try the paid version. After the fact I have found random YouTube videos showing how it works, along w/ the dev's website
http://torque-bhp.com/, which has a forum and everything...maybe has only 2-3 BMW users though. Supposedly some users have reported issues using the eBay readers, and the dev recommends against them (while plugging a certain brand from his website...sponsorship making him play favorites?), but I've yet to see a review or failure using the inexpensive version.
Either way, cool little app and device I wanted to share w/ you guys. I've been able to stand 3-4 bays away from a car while still monitoring coolant & intake temps, engine rpms, reading and clearing codes, etc...all from my phone. A few settings within the app needed to be changed, so if anyone purchases and can't get it working, let me know.
Enjoy
__________________
650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's
325hp 98 BMW 740iL -
///M5 6spd,
www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex
600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's