4предложения на про то,что телефон самый надёжный источник ! заранее большое !

phone - a source of communication at a distance. If you're away fromyour home phone you can call without any problems. just on the phone a lot of different functions: GPRS, games, navigation, etc.

написала сама,скорее правильно)

I can*t even imagine a single day without my  mobile  phone.  You can speak to everybody  when  and where you want. Besides. nowadays  mobile telephone has all functions of a computer. You can use the Inthernet . social sites and other sites when you need