The app won't let me scan says sensor is in use by another device. I like to use the phone and device, I use the phone when I am out and do not have my device with me. Update contacted customer service they say it cannot be used with the phone and the reader at the same time. Very disappointed on this, you used to be able to use with both phone and reader, not happy may consider switching to a different reader. So in short either reader or phone, the purpose was i dont carry my reader with me at all times thats why i like the convenience of the phone