[kashkoi]

hey, My friend just send me this phone from uk to pakistan, its vodafone carrier and unlocked. my problem is when i make a call its voice break then again connect then again break the volume leveler shows up and down up and down continuously during the call. and strangely sometimes the media player automatically mute the sound when this calling problem occurs. Plz help me in this regards.
Is it possible that I can upgrade my phone version 4.2.2.145(265) to a newer version? If so Then how?
and how can i get the applications for my phone?

thanks in advance