I have been advised to hold onto my 5s as a back up. I wanted to know how fast will the phone's battery drain if the phone is turned off? Also, how many songs can 128GB hold? I have never put my music on my phone, but I was considering it with a new phone. I am not sure how you put CDs onto a phone, though. I guess you upload the CDs to your laptop and then transfer them to your phone??? Thanks!