A co sie stalo z uzywaniem 'a' ???
Firstly you can take 'everywhere mobile phones' (zla kol slow i do tego ile tych mobiles potrzebujesz, myslalam ze jednego a wtedy 'a mobile phone').
The main advantage of mobile phones is that mobile phones can 'be used also' (zla kol slow ..can also be used) AS AN organizer AND 'A' radio apart from calling. Secondly you can send 'massage' (massage to napewno nie - moze message) to someone if you haven't enough money. Firstly 'A' disadvantage (ale czewgo?) is that mobile phones replaces 'meet with calling' ( chyba masz na mysli a face-to-face meeting - to jak tak, to pisz tak), so we forget about other people.
'These people haven't our number of mobile phones.' (tego zdania nie rozumiem tutaj)
The main disadvantage of mobile phones is that when people take these
to church or theatre and 'calling' MAKE CALLS (ale to swiadczy tylko o zlym wychowaniu z domu - a nie ze to jest wina mobile phone).
Personally I think that mobile phones are necessary IN ORDER to MAKE contact with people 'in somewhere' (chyba somewhere else other than) A phone box.
On balance today a person who hasn't a mobile phone 'will be have' (fajne polaczenie - ale niestety to jest zle - mobile phone will have) enough problemS with contactING 'to' (niepotr) OTHER people.