Cell phone numbers answer all the time with out a phone being on... its called voice mail...what to you think happen when you call a cell and its off..a busy signal? nothing?
I am aware of what happens when a phone is off. It goes DIRECTLY to voicemail, it doesn’t ring 4 times and then go.
After years of raising my 21 & 24 year old daughters, I am well acquainted with what happens when you call a dead or turned off phone...or when they hit the ignore button (one or may two rings and then voicemail).