In my teenage days, before we had cell phones, I had this Motorola numeric pager. At home on my computer running OS/2, there was VoiceConnect running in a #DOS window. When friends tried to reach me, they called my land line, the modem answered and they left a voice message. VoiceConnect then called my pager to inform me about a new message and I went to the next telephone booth to call VoiceConnect at home. By entering a DTMF password, I was able to listen to the message.. "Hey, let's meet 2pm at the shopping center!"