PSPs all have built in wifi, and is accessable from any area with a wireless hotspot.
Yes They Do Not Very Good Access, But They Do
PSPs connect to your wireless router. There's no additional cost for this, but you do of course need wireless internet.
PSPs are not like phones, with their internet packages and data transfer plans. PSPs connect to your wireless router in the same way as a laptop or PC does. So the internet doesn't 'cost' anything when you do this, but you do of course need to actually have wireless internet in the first place, and the PSP can only connect when it is within range.
PSPs can make already make connections with a wireless internet access point. There's no need to 'hack' the PSP, it's there by default. Of course, you need to know the SSID and passcode for that particular access point - 'hacking' that is illegal, and also nothing to do with the PSP itself.
yes psp's have internet
Yes, Hence the name PlayStation Portable
I think you do. I'm not sure
Yes, You have to set it up first.
PSP go has an 16GB built-in memory unlike other PSPs that has 36 MB & others has 62 MB.
Yes, all PSPs can access the PlayStation Network.
it will obviously, any use of internet (if you own it) you have to pay for it. Actually it depends on how long you use the PSP. Well, my uncle said if!!!!!!!! you have the iPhone on your psp he thinks it costs money but i don't know. internet is free to psps provided the wireless connection your trying to use isn't password blocked.
You don't need anything - two PSPs can create an 'ad hoc' connection with each other, with their own wireless capabilities. There is no need for any kind of add-on or cable, and so those do not exist.