Yup, you sure can. You can use wireless internet on all ps3's.
A PS3 slim has WiFi and wired capabilities for internet usage. It will depend on each individuals internet connection as to the slowness of the PS3.
You can not share your phone wireless internet with your PS3. The PS3 will search for a WiFi connection and if one is found it can be used to connect to the internet. If you have internet service it is not a problem to connect to the PS3
yes
All PS3 but the first 20 GB model are wireless. That means if you already have a wireless internet connection they can connect to it.
It should work the same way, make sure you have an internet connection and are connected to the PlayStation Network.
It depends if you have public internet in your area or an unsecured network.
None the PS3 slim does not play PS2 games
Some PS3 have wireless network adapter installed and only what you need is to connect to your existing wireless network. Instructions are here http://www.ehow.com/how_4812599_up-ps-via-wireless-router.html If you do not have a wireless adapter, than you are stuck. So far there are no adapters which would work with PS3.
First you need a wireless internet connection before you can connect the PS3 to wireless internet. You can not connect the PlayStation without already having internet service. If you have wireless internet service then you go to the PlayStation 3 settings to network connections. If you do not have a wireless internet, but have internet service you purchase a wireless Router and install it first before going to the PS3 setting for network connection. You can also connect a wired system running an ethernet cable from your router to the back of the PS3 and then going to the setting for network connection.
Your PS3 must have a wireless adapter installed if you want to connect to the internet wirelessly. Otherwise, if you don't you will have to use an Ethernet cable. If you have a wireless adapter installed on your PS3. You will need to connect it to your wireless router. Go to the wireless network menu on your PS3. Find the (SSID) network name of your network. Connect to it!
As far as I know all PS3's game with a wireless internet adapter installed. You just need to go into your PS3 settings and find the Internet/Network Connection settings. Once you find that you can have the PS3 guide you step by step on how to hook up y0 PS3 to your wireless internet connection.