Preping a second hand iPhone for use?

My friend is giving me his old contract iPhone 4 and my htc has gone and died. How is best to prepare it for me being the new owner?

I'm getting a Pay as you go microsim for it

Wireless vs Wired connections?

I have a wireless router and it has wired connections. How do I make sure my computer, wired by ethernet cable, is using the cable instead of wireless? I'm using Windows 7 and when I'm wired (have wireless turned off) I have the square box icon for my connectivity. When I turn wireless on so others can use the connection I get the signal bars.

My problem is we have 3 iPods, 1 iPhone, 2 laptops, a PS3 and another 2 phones that can all be on at once. When I'm on Facebook, and everyone else is on Facebook I can't load a page or send a message. It's driving me crazy.

If I could make sure my computer gets the wired bandwidth and the others can fight over the wireless (currently one laptop on Skype and 2 iPads on Facebook and me here).

Suggestions please.

Added (1). I apologise, I should have added the type of router:

Linksys WAG320N - 4 wired ports.

Added (2). Thanks Dan Karas,

My problem is everyone else gets good facebook connectivity except me. If I bring my Laptop home I can get the same connectivity. But the one wired computer to the Linksys router is the one that facebook won't load or send messages. Unless everyone else goes to bed. Most other things seem to happen at reasonable speeds.

Do I need a different SIM card for an iPhone 5?

I have an Orange contract ut don't like the android phone I have. I was going to buy myself an iPhone 5 but do I need a new SIM card to go with it or would the one I currently have fit?

How to tell if someone is fake?

So a girl in one of my classes when we were in school… I guess I could call her a friend but there was something suspicious about her, first I followed her on Instagram but maybe a few days later she unfollowed me, then an incident where I asked her to bring special brownies one day becuz I've never tried them she forgot and kept forgetting and didn't bring them in the end, one last thing she doesn't seem to answer my texts like I will say hey girl or something we both have iPhones and it tells when she saw it she never replys. So what's her deal? Was she pretending to be my friend cuz we had a common friend in the class? (Also I didn't repeated txt her, expect about the brownies)

My iPhone doesn't charge - 1

So I just recently got an iPhone 4s. Its used and it wasn't really expensive either. So I got it. And then the guy that sold phones said to me that if I let the phone die, that I would lose all of my contacts and everything. And guess what happened? It died D: And i don't know how it died, I remember last time, it was at 30% battery, and I didn't even use it. Then 2 hours later I check my phone, its not charged, and doesn't want to turn on. I try charging my phone, and try pressing the home button, but nothing seems to work. It just shows the apple logo when i'm trying to charge it. It doesn't charge either now. How can I fix this?

Is polycarbonate a shock absorbing material?

I'm very interested in an iPhone case that is made from polycarbonate and I'm just worried about the shock absorption. I know it is a ver safe and durable material, but I'm worried about the shock absorption