Multiple choice general knowledge To work on mobile cell phone which of the following is/are required? Favourable handset Service provider network Sim card All of the above Reveal answer Fill a bubble to check yourself D Correct answer Explanation For a mobile phone to function, you need: (1) a compatible handset, (2) SIM card for subscriber identification, and (3) service provider network for connectivity. All three components are essential, making 'All of the above' the correct answer.