BB Curve :: How To Connect To Internet And Set-up BBM And Other Setups

i purchasd a new blackberry curve 8520 3days before, i put a sim card of Airtel , then i find problem in importing contacts from my old LG mobile set , some how i solved it, then for internet acess , i want it to set up wi fi with my own office wi-fi connection . i did the fallowing step by step

1- switch on the wi-fi
2- set up wi fi after scan i put the wep key
3- it shown sucessfull connection massage
4- i saved the wi-fi
5- the name of wi-fi comes next to service provider name at top of the screen as i enters the are of wi-fi
6- on mobile network i switched off the service provider
7- on browser i selected hot-spot browser

then i coonect to the web, it always answers it is not connected to interent , i went thru many solution as solved over this support center still iam unable to connect. where as i am easy with my laptop connected with the same wi-fi.so please suggest me the way how can a coonect to the internet and set-up BBM and other setups.