Patent Issues
In August 2011, a patent was granted to Apple for "Voicemail manager for portable multifunction device"
Klausner Technologies Inc. of Sagaponack, NY claims a patent to Visual Voicemail, named *Telephone answering device linking displayed data with recorded audio message* and has brought dozens of lawsuits against Apple, Callware, Google, Microsoft, Oracle, MetroPCS, Digium, Schmooze Com Inc and others for patent violations.
Some of these cases have settled, but many defendants claim "prior art" or an "obvious" technological evolution, because non-sequential or random access to messages has been offered since at least 1993 by Wang, AT&T, Novell and other 3rd parties.
Read more about this topic: Visual Voicemail
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—Virginia Woolf (1882–1941)