Back in the days before caller ID, one of the only ways to screen an incoming call aside from having someone else answer and say you weren't home, was to let the answering machine pick up. Then, based on the urgency and content of the call, you could either pick up or ignore and let the recording finish. With caller ID, you can ignore calls you don't want to take, but you don't know the subject of the call, which can leave you with worries - what if it was an emergency? Of course you could always wait for a voicemail to show up and then decide whether or not to call back, but judging by Apple's new patent, you may soon be able to listen to voicemails on your iPhone as they are being recorded, and answer if you want to.
According to Apple Insider, Apple probably acquired the patent through Rockstar consortium's purchase of a collection of some 6,000 Nortel patents (Rockstar is a consortium of tech companies including Apple, Microsoft, Research in Motion,