I have an Android phone. The phone as key works about 50/50. It will go in spurts where it won't work for a few days and then it works well. Then it stops working again. I've tried lots of stuff with the phone, but to no avail. So the card key is my primary key now and it works great. I have it wedged in between two company badge photos in a plastic case on a lanyard, so its always within reach as my daily driver.
I'm sure that someday the phone software will get better, so I'm not worried about it. There's also the issue about the car locking and unlocking way too much in the garage when I'm moving around it with my phone bluetooth turned on (when it is working). So I use the card key for now and will check back in with the phone software later...