How can I get wifi on my iPhone 4?

[ρυяρℓє ѕтσямz]

Okay I really need help here. I can't pay my phone bill in till Thursday, and I usually have wifi at my house so I can use my phone, but I am staying at my grandmother's house (she has no wifi and only 1 desktop computer, what I'm using now) in till New Years Eve (This Tuesday) I REALLY need to use my phone to get in contact with a friend for very important reasons (I also can't use any social media on this computer so no Facebook). I also need to do a lot of other things...Is there any possible way I can like download an app or set up a wifi thing on her desktop so I can get my phone to have wifi on it? Thanks for the answers in advanced, I appreciate it! (: Sorry if this sounds like a stupid question lol

[Colin]

You're stuck using the computer unless you want to go out and buy a router which takes in the Ethernet cable going into the computer and produces wifi out of it. Can cost anywhere from $30-$150 so probably not the best option but the only one. Sounds a bit silly you can't use social media on the computer yet you can use yahoo answers. That's just my 2 cents