Yes, I tend to turn my phone off at night when I'm asleep. That is, of course, 
unless it is being charged. But I have certainly turned my phone off on various 
occasions since getting it. So that may explain the problem. Unfortunately, I 
don't have anything I want to buy right now to test out the theory, since it 
has been less than four hours since I signed in and made that purchase.
Mary

Sent from my iPhone

> On Sep 28, 2015, at 9:34 AM, Regina Alvarado <[email protected]> 
> wrote:
> 
> Mary, have you turn your phone off lately? I believe there is a time period, 
> about 4 hours, where you can use your fingerprint after signing in with your 
> Apple ID. If you have shut down your phone, you have to always sign in. Clear 
> as mud? 
> 
> reggie & Lex
> 
> On Sep 28, 2015, at 12:08 PM, Mary Otten <[email protected]> wrote:
> 
> I am confused about the use of touch ID in places like the iBooks store, app 
> store or iTunes store. I thought I was set up for that. But I just purchased 
> an iBook. I hit the buy button and was prompted to sign in with my password. 
> I put my finger on the home  button for touch ID, nothing happened. So I 
> signed  in the usual way and the book was purchased. Now I don't have a 
> problem signing in. I have been doing it for a long time. But I am confused 
> as to how this touch ID thing is supposed to work. There must be some setting 
> I am missing. Or I just don't understand its operation.
> Mary
> 
> Sent from my iPhone
> 
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