Android timeline

EPOC32 1.0 > 5.1

Period: 1997 to 2001

Symbian OS 6.0

Period: 2001 to 2002

Symbian OS 6.1

Period: 2002 to 2008

Apple Pie

Period: Sep 23, 2008 to Feb 9, 2009

Cupcake

Period: 2009 to 2009

Eclair

Period: 2009 to 2010

Banana Bread

Period: Feb 9, 2009 to Apr 25, 2009

Donut

Period: Apr 25, 2009 to Sep 15, 2009

Windows Phone 7

Period: Feb 15, 2010 to Sep 15, 2012

Froyo

Period: May 20, 2010 to Dec 6, 2010

Gingerbread

Period: Dec 6, 2010 to Feb 22, 2011

Ice Cream Sandwich

Period: 2011 to 2012

Honeycomb

Period: Feb 22, 2011 to Oct 15, 2011

Jelly Bean

Period: Jul 9, 2012 to Oct 31, 2013

Windows Phone 8

Period: Sep 14, 2012 to Apr 2, 2014

KitKat

Period: Oct 31, 2013 to Nov 12, 2014

Windows 8.1

Period: Apr 2, 2014 to Oct 12, 2014

Lollipop

Period: Oct 12, 2014 to Oct 5, 2015

Marshmallow

Period: Oct 5, 2015 to Jun 15, 2016

Nougat

Period: Jun 15, 2016 to Aug 21, 2017

Oreo

Period: Aug 21, 2017 to Aug 6, 2018

Pie

Period: Aug 6, 2018 to Sep 3, 2019

Android 10

Period: Sep 3, 2019 to 2020