Back in the day, I remember Verizon Mobile had a thing where you could dial into your voicemail and then they had an option to leave a voicemail for another VZN

Back in the day, I remember Verizon Mobile had a thing where you could dial into your voicemail and then they had an option to leave a voicemail for another VZN subscriber just by punching in their number. I used this a couple of times to listen to an unknown caller's outgoing message.