BlackBerry functions as a personal digital assistant with address book, calendar and to-do list capabilities. It also functions as a portable media player with support for music and video playback and camera picture and video capabilities. BlackBerry is primarily known for its ability to send and receive (push) Internet e-mail wherever mobile network service coverage is present, or through Wi-Fi connectivity. BlackBerry is mainly a messaging phone with the largest array of messaging features in a smartphone today. This includes auto-text, auto-correct, text prediction, support for many languages, keyboard shortcuts, text emoticons, push email, push Facebook and Myspace notifications, push Ebay notifications, push instant messaging with BlackBerry Messenger, Google Messenger, ICQ, Windows Live Messenger and Yahoo Messenger; threaded text messaging and a customizable indicator light near the top right of all Blackberry devices. All notifications and conversations from applications are shown in a unified messaging application which third party applications can access also. Many of these applications would have to be running in the background of other phones to be used. BlackBerry's push gives BlackBerry devices their renowned battery life. All data on the phone is compressed through BlackBerry Internet Service (BIS). BlackBerry has about two thirds less data transfer than any other smartphone, while supplying the same information.