mobile apps

1. advantages

1.1. convenient

1.2. with a variety of apps

1.3. pass time

1.4. free of charge

2. stores

2.1. App Store (iOS)

2.2. Google Play

2.3. Windows Store

2.4. BlackBerry World

2.5. Nokia Store

3. categories

3.1. business

3.2. education

3.3. social

3.3.1. e.g.

3.4. game

3.4.1. e.g.

3.5. leisure

3.6. informative

3.7. photos

3.8. music

4. disadvantages

4.1. damage eyes

4.2. addictive

4.3. waste time

4.4. use up battery

5. cost

5.1. free

5.2. paid