Android Basic Go Back Android Operating Systems & Apps views 4:35 When mobile phones were introduced in the market some years back, only a few people could afford them. In those days, these phones could not do much beyond calling and sms. But with time the number of features in the phone went on increasing and soon the smart phone was introduced in the market. Nowadays, it is rare to find a person who does not own a smart phone. Now, let us see what features make a mobile phone a smart phone. Android Operating Systems & Apps Creating First App Designing Your App Views of Apps Changing the Apps Look Making an Interactive App