app world, wifi etc.

Hi, im a new blackberry user and have it on pay as you go. Just want to know really that you can use app world via wi-fi? i have wifi at home but i have just downloaded app world and it says 'i dont have sufficeint wifi coverage'? but i am able to browse the internet?

also just wanted to know about wifi in genreal really. is there loads of wifi hotspots nowadays? i just want to know where i am able to use the internet and how would i know that im accessing the internet via wifi and not the normal way where it owuld charge me?

thanks people!

please anybody...?

App World Requires a BB Data Plan... no way around that issue.

so u defo cant go on app world with wi-fi i read that you could!?