Collect call...help!?

Question

If someone calls me through a collect call service and I just hang up after listening to the message, would he know that I picked up the phone or how long I listened to the message?

...Sometimes I'd just listen to a second and when I hear it's automated, I hang up cause it can be telemarketers

Also, would the caller know if my cell phone doesn't allow collect calls to go through?

Answer 1

Sounds like someone from jail or prison is calling you..YES they know you chose to not accept the charges if you listened to the message.