If you thought the Symbian platform was already dead, you thought wrong. Nokia has just pushed a "Telephony update" for the Symbian OS on Nokia 701 and 808 PureView.
The update is small in size and you can get it over-the-air.
According to the log, the update is called Telephony update and brings "quality improvements". There are no new features to come with it, but the fact that Nokia pushed it probably means you better get it. It will most probably fix those network-switching glitches that some people were experiencing.Source