What is the use of mobile devices? Mobile phones are used for various purposes, such as keeping in touch with family members, conducting business, and having access to a telephone in an emergency. Some people carry more than one mobile phone for different purposes, such as for business and personal use. What Does Mobile Device Mean? A mobile device is a handheld tablet or another device made for portability and is therefore both compact and lightweight. New data storage, processing and display technologies have allowed these small devices to do nearly anything that had previously been traditionally done with larger personal computers. Mobile devices are also known as handheld computers. What are the five uses of mobile phones? In brief, the survey found that the top 5 activities for smartphone users are: Accessing local information. Searching for information. Participating on social media/networking sites. Reading news and entertainment. Finding local services.