Why can't I turn Wi-Fi on my iPhone 4S?

It won't even give me the option.i've tried restoring settings updating to ios6.3 or whatsoever it's called lol. If someone can help that would be brilliant. I have Wi-Fi at home and it's so annoyin I can't use it x

You need your password to your Wi-Fi. If it the password doesn't work, call your service provider.

1. Go to settings
2. Tap Wi-Fi
3. Click the name of your Wi-Fi and tap in your password.
4. Maybe you are clicking the wrong Wi-Fi for you, so call your Wi-Fi providers.

On your iPhone, launch the Settings app.
1. Select Wi-Fi.
2. A list of Wi-Fi networks will load. If your Wi-Fi doesn't appear in the list, that means the network is not accessible (maybe it's off, or not configured to accept wireless connections). Select the Wi-Fi you want to connect to.
3. If this is the first time connecting, you will be prompted for the Wi-Fi network's passphrase (WPA, WPA2, or whatever encryption scheme you've setup on the router).
4. Once connected, you will see a "wave" icon appear at the top in the status bar next to your signal.

Judging from the flood of posts an an Apple forum while researching why my boss' 4S had the same problem, Wi-Fi on iPhones can be troublesome, including some iOS versions being flaky about what Wi-Fi they can connect to, and hardware failures.

My boss had both problems, Wi-Fi would not connect to our office Wi-Fi until he could find Wi-Fi it would connect to at home, to update his iOS (which refused to update using mobile data). And eventually he could not even turn Wi-Fi ON (remained grayed out). We tried everything that worked for some people including resetting networking and backing up and resetting the entire phone, and nothing helped. So he ended up getting a warranty replacement 4S.