My iPhone doesn't recognize Wi-Fi?

I got an iPhone 4 yesterday, and I had it connected to the Wi-Fi. It takes a few seconds, but after I unlock it, it says it is connected. Then anytime I try to go to an app that needs Internet, it switches to 3G. I can go to any other apps, like my notes or photos, and will stay connected, but when I need Wi-Fi, it won't connect. I've tries going to my settings, but it says it can't find my network. I can't find ANY networks. I lock the phone again, then unlock it and it does the exact same thing. Why does it do that and how can I fix it?

Second iPhone 5 cord is broken what can I do?

I've had my iPhone for about six months now, my first iPhone cord stopped working after about four months (the wires snapped in half with in the rubber tubbing) So I bought a second one which only lasted two months… The same exact thing happened. Is there any way I can contact Apple and have them send me a new one for free? I'm tired of paying for new iPhone cords.

Restoring iPhone from backup? - 1

My notes randomly deleted themselves. I really need those notes, so I read that I should restore from backup. My last back up was awhile ago, 4/19. If I restore my iPhone from backup will my current pictures I took and texts received after that date be deleted?

Can I upgrade my iphone from Sprint?

I just got my iphone last week and its an iphone 4 with 8 gigs and i already used half the memory with pretty much just music alone. I know there's no way to install new memory but if i were to switch from 4 to 5gen could i do it then? Cus they don't make 4 anymore, so should i just wait for the 5th gen to take over and replace it then?

Added (1). But if I trade it in I think theyll still give me 4 gen so should i wait until they're completely out of 4s?

Pandora Downloader for iPhone not working?

There was an update for Pandora today and now there's no arrow between the Thumbs down & up like there used to be, so now I can't save songs to pandora downloader, is anybody else having this problem?

Other iPhone category growing to half my total space?

The "other" category on my iphone 4 is now consuming about half of my 8gb. I don't know what it is or how to get rid of it. I do know that NONE of my apps are taking up alot of space and oi only have under 20 apps total… IPhoto doesn't have alot and neither does my music or videos. WHAT IS HAPPENEING?