What is a prepaid phone?

The phone is called "prepaid" because it is specifically intended to be used with prepaid service.

It probably comes with just enough minutes

so that you can set it up and buy more minutes.

It means that you prepay monthly for the cell phone service. When you do this, you often get cheaper rates, and you aren't locked into contracts with carriers.

Sorry, it won't work just by accessing wi-fi. You still need a service of some kind. Yes, you could use Skype as that service, but they will want you to pay a fee for calls and a telephone number. One way or another, if you want telephone service, you'll have to pay someone for the service.

Do you mean that you would like to purchase the phone and connect the phone to your homes Wi-Fi and use it as a mini tablet? You do not have to activate the phone, but you can not get a phone number and make calls unless you activate the phone.

It will work if you use it to connect to wifi!