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Android OS and Android SDK comes with a set of core applications, all written using the Javaprogramming language, including an email client, SMS program, calendar, maps, browser, contacts, and others. Google's Android is much more available and talked about than any other mobileOS.
https://www.sololearn.com/discuss/275783/?ref=app
https://www.sololearn.com/discuss/797546/?ref=app
https://www.sololearn.com/discuss/717086/?ref=app
https://www.sololearn.com/discuss/244889/?ref=app