My Wi-Fi won't switch on on my iphone?

For some reason i'm not able to turn on the Wi-Fi from the options on my iphone. Its literally greyed out and i don't know what to do. Its annoying please help!

My iphone 4 doesn't want to pick up Wi-Fi?

I had an iPhone 4 for the past few months and the Wi-Fi works great everywhere I go that has Wi-Fi. Unfortunately it broke a few days ago and i got a new phone, another iPhone 4. No matter where I go, it doesn't pick up Wi-Fi. There definitely is working Wi-Fi where I'm, because I've been using it for months and also at the moment.
the Wi-Fi on my phone is ON.
the Wi-Fi router is WORKING.
i tried resetting network settings, it did nothing
i tried resetting all settings, still no Wi-Fi.
anyone have any suggestions?

My Iphone 3 won't work properly

I put my iphone 3 on charge, it does it's thing charging etc, once it's finished it goes to the homescreen, sits there for about 1-2 seconds then turns off and begins to re-charge. Only very rarely it stays on for around 30 seconds - 1 minute then continues to do the cycle. I'm not sure what to do, maybe it's the battery? Any help appreciated!

Added (1). To all those who answered so quick and answers to come thanks so much! I'll do as you say and report the news!

How to connect an apple iphone to a belkin wireless router?

I have an apple iphone 4s that can't be connected to the wireless router. We have tried:
resetting the network key
reset the router
disabled the security

and still nothing any suggestions or a step by step this is annoying that other devices connect to the wireless but my iphone can't

My iphone 4s stuck in recovery mode and won't charge?

My iphone is out of battery so when i try to charge it apple logo comes up for about 5 seconds, and then it shows recovery mode, So i connected it to my windows pc itunes but since its out of battery it won't connect to itunes, Oh and when it shows recovery mode its supposed to charge but as soon as i take out plug it goes black screen and won't turn on(shuts down).

Can you unblock an imei? Iphone 5?

Someone on Ebay is selling an Iphone 5 and it says its IMEI blocked. I know in the past I've unlocked my imei on previous iphone's would this work with the iphone 5 or is it totally useless. Seems a bit strange because it doesn't look stolen because comes with box & accessories. Its a bargain.

Is there anyway I could use the phone if I bought it.

From where to buy a sim card with a usa number? (traveler asking)?

I'm from Europe.
I will go to usa (ny and LA) in December.
As i will go there for business i want to buy an american number. But i want to have it before i live because i want to give it to people who want me for work so they can call me.
From where online can i buy a sim card with an american number?
I have an iphone 4s and i want a sim card that it will have for example 3$ . I don't want to use the sim card in order to call. I want to use it so people in america can call me.
What can i do? Fromwhere can i buy it?

How much is the Iphone 3g monthly fee?

My friend is selling her Iphone 3g to me for 100 dollars, and she has at&t and so do I. I don't know how much the monthly fee is. I think it is 30 bucks but i don't know… I really don't want to pay that… Help!

How much is my iPhone worth?

I'm going to sell my iPhone 4S, I've used it for a couple of months. It has no scratches at all, no use of wear, no smudges. It looks brand new. Since the day I've got it, I've had it in a case and screen protectors. I have the box, and the charger, the cord, the manual, but not the headphones. So how much is it worth, do you think?

My iphone 4 got stolen? What should I do?

Two days ago my iphone 4 was snatched from my bag at Target. I didn't realize it was missing until several hours later. This is the first time this has happened, I always take good care of my cell and have never lost it. My phone is under my aunt's family plan so I called her and she got my cell's service terminated. People have been telling me recently that I can track my phone, or try to get it using the security footage at Target. My aunt has been doing a lot for my family, and has given me the cell and paid for the service since I'm currently unemployed. I really don't want to cause her any trouble, I'm willing to downgrade to a cheaper cell. What should I do? What would be the wisest thing to do?