should i buy the mobile sony ericsson xperia x10i?

there is used mobile that i want to buy it is xperia x10i and i saw the set and it has its phone deafualt ringtones but market is no where to be seen and no play store is seen in the phone and so should i buy this phone and tell me the price of xperia x10i in pakistan
tell that there is no market app on the phone is it flashed by someone