Instead of an answering machine in an apartment, how about a voice mail system? Call a number, enter a PIN. Listen to your messages.
The catch. Deckers can backdoor the system and listen to all the messages. And maybe even setup their own mailboxes.
Additional features. Monthly cost. Or per message cost. Or, whatever cost. With deckers being able to dodge those and create "free" accounts.
Expanded scope. Factions setup their own systems. Start ups offer services to those who aren't in factions. All of these systems need to be secured. And kept secure.
I get that one is 'talking' and one is 'writing' ICly, but it's all writing OOCly in the end :)
The idea of someone being able to eavesdrop is cool though. I'll look at adding that to the existing systems.