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The mobile phone is one of the latest inventions for man to communicate. it uses a lot of people around the world.
He has many advantages and disadvantages, but I think that it is bad for us.
The phone often becomes an addiction for young people who sometimes can not live without it!
I think that it may cause problems. Some students forget that they do not use the phone in the classroom, but
often do not adapt to this. Mobile phones can also bring financial problems because
they are very expensive. I think that everyone in the world should limit their use of mobile and instead of writing messages
SMS, make calls, should meet in a coffee shop or other place realistic.

He has - kto to "on"?
Becomes an addiction - ujmij to inaczej, moze izyj to become addicted to
make calls - dzwonic, a masz napisac "dzwonienia"

Some students forget that they do not use the phone in the classroom, but
often do not adapt to this.
hmmm;) jak to można rozumieć?

The mobile phone is one of the latest inventions for (cos tu brak) man to communicate (ale z kim? musisz napisac) . 'it' (duxa litera) 'uses' (ale w jaki sposob?) a lot of people around the world.
'He' (nie wiem o kim mowa? telephone to jest 'it') has many advantages and disadvantages, but I think that it is bad for us.
I think that 'it' (tutaj nie rozumiem do czego to sie odnosi? do addiction?) may cause problems. Some students forget that they 'do' (to jest zle slowo, tutaj daj modal) not use the phone in the classroom, but
often do not adapt to this.
I think that everyone in the world should limit their use of mobile and instead 'of' (to jest zle slowo, wytlumacz dokladnie co masz na mysli) writing messages SMS, make calls, should meet in a coffee shop or other place 'realistic' (calkowicie zle slowo).