IPhone white screen problem?

IPhone 4, AT&T, 16GB. Whenever I click the home button, white screen. Connected to iTunes, said unable to connect at this time, try again later. Please help! Replacements aren't cheap!

Added (1). Lock button is destroyed. Got it used.Am I SOL?

Apps that track how far you bike?

Are their any FREE apps out there that I can get to track how far/long I bike? I have an iPod touch NOT an iPhone so I don't know if there are any apps that will work on an iPod since many of them need the GPS function and as far as I know they don't work if I don't have Wi-Fi.

What do I do if a mobile ad pops up?

While I was looking through a page here, a mobile p**n ad popped up. I quickly deleted it! I have an iPhone btw. IPhone 5 if that is important. I did not download it!

Why is the Wi-Fi on my iPhone and iPad so slow?

I have an iPhone 4, original iPad, and a big Mac computer. I'm having to ask this question on the computer because the connection is that frustrating. I have xfinity, which is usually fast, but right now it's just unbearable. But it's only on my iPad and iPhone. Why is this? How can I fix this? I've already reset both devices and it didn't work

Why are iPhone chargers so flimsy?

I've gone through three iPhone chargers just with in the past year. Is Apple purposely making crappy chargers so consumers have to constantly pay for over priced iPhone materials? Please don't comment "Well, it's obviously how you treat your charger." It's not like the iPhone has been the only phone ever made. I've had several phones before my new iPhone and I treated the chargers all the same without having any problems. Can anyone else relate because for a fact I know I'm not sounding crazy.

Why won't my iPhone 4 send pictures/videos?

My cellular data is on and so is my MMS messaging, but whenever I go to send a picture or a video it remains in the process of "sending" (with the process bar at the top of the message) forever, which is really draining my battery, and just frustrating!
Can anyone help?