Types of abstracts. There are two types of abstracts: descriptive and informative. They have different aims, so as a consequence they have different components and styles. There is also a third type called critical, but it is rarely used.
Samsung Galaxy Note 7 smartphone has been banned from all aircraft in the United States. The US Transportation Department and other agencies have banned passengers from carrying on the devices or putting them inside checked baggage during flights.
Rarely, you come across areas where cell phone use is prohibited. Cell phones communicate with each other through radio waves, which can be an interruption in hospitals, airplanes and any other area that uses a lot of electronics.