Hii friends I am going to share my personal experience with you Using this phone after 5 years best os and nice phone. Used android Android is just a piece of scrap I hate android now I have my Nokia c5-00 in my hand and commenting this very comment hopping that I will never forget my fast smart phone that make my life batter for the last 3.5 year 2gb ram is less fr this glutton os C5 has just 128mb ram and runs like butter.lumia are better And symbian is best If symbian apps developer worked properly It is a powerful NOKIA C5-00