If your phone is wifi capable, yes.
Definitely yes.
A wifi phone is just a phone that can use wifi. You would connect it to a wifi network to get a better signal for faster web browsing than a cell tower.
If both the SIM you want to use and the phone you want to use it on are unlocked, then this is possible.
Yes, but keep in mind that data is stolen in public wifi sites.
Having an unlocked phone allows you to use the phone with different carriers. Keep in mind some services may not function on an unlocked phone.
Take it into a phone company that offer's the use of unlocked phones and they should activate it for you.
Yes, if unlocked you can use it.
Unless you can find room in the phone to add an wifi card and can hack the software to make it compatible, no.
what is an unlocked cell phone
it depends on the phone. typically, no.
Nope unless your phone is unlocked from fido.. You can get your phone unlocked from any vendors online like Unlocking4u.com
Yes it is wifi compatible. Nearly every 4g phone uses wifi.