Question - Difference between mobile and a cell phone.
Answer -
There is no difference, just language use, which differs from country to country, so in Britain it is called a mobile, and in USA and South Africa and other places a cell phone.
Even in Europe the name differs. The Germans call it a “handy”, which in English has completely another meaning as an adjective, meaning useful.
In Italy it is called a telofonino or “little phone”.
This difference in British and American English is also evident in many other things we use every day, like lifts and elevators, nappies and diapers, pickups and trucks. The list goes on and on, any student of English has to decide which he or she will use, as the default setting.