thanks SAFFWAN and loveshakeh ,problem of internet settings now solved.
I have one more question , as i've upgraded from symbian (nokia 500) in which i usually downloaded apps on PC and then Install them to device but on xperia p whenever I click install on any aap on playstore on PC the aap starts to download on mobile phone resuting in a lot of data consumption and time expenditure.
Is there any way to download aap by using internet on pc and then installling on divice or the apps can only be downloaded via mobile GPRS/WIFI
thanks in advance