No, unless the place you are at require a charge to use their Wifi, but normally it is a free service
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 your phone is wifi capable, yes.
Yes you can, you use wifi. However, it will either need to be your own or in a hotspot that does not charge for the use of their wifi. Hotspots can be found in places such as pubs, clubs, train stations.
Unless you can find room in the phone to add an wifi card and can hack the software to make it compatible, no.
Yes, there is no charge to use wifi, no data limit. you just have to get a source of wifi.
it depends on the phone. typically, no.
Yes it is wifi compatible. Nearly every 4g phone uses wifi.
for sure, i use mine to make call
Wifi networks are really wireless internet networks. Smart phones need the internet to function, so naturally your phone is going to be searching for a wifi network to use.
It is important to have wifi on your phone because it costs money to use the 3G. You may not always have access to the 3G either, and if you don't you might have wifi access.
The one that have the wifi. Go to a theater and watch the movie and not use your phone.