In the 90's a company called Philips produced a mobile phone. Which was a device that could make phone calls while you mobile.
Then they (and other companies) started adding more function. Like sms, mms, mobile cameras etc.. After a while they managed to get internet onto those devices, which nade it possible to browse the internet on your so called mobile phone. There still are some function which are annoying (like more typos while writing, failing auto-correction, etc.).
I hope you understand now, and if not, you're the dumbest motherfucker ever.