I was hoping that since I'm not really trying to communicate or pair with the iphone (just detect and ID), some of these limitation may still let me get my project to work. But it sounds like I should wait for a Bluetooth 4.0 shield. Instead of using bluetooth to unlock the door, maybe I'll just use the thumbprint reader that Adafruit just came out with. I like the bluetooth project a lot. I think it would be really cool if a door unlocked as I approached. But I'm not going to switch phones just for this.