My iPhone 4 is stuck on loading screen?

My iPhone is Jailbroken and I was trying to install something from Cydia and then it let me to a light black screen. I couldn't do anything when I had the light black screen. So then I waited to the battery get dry, and when I charged it back on, it had the Apple's logo, then it led to the loading circle. After 5-10 minutes of the loading circle, it led to the Apple's logo again and then led to the loading circle. This has been going for about 4 hours or so. I tried holding the power button and home button for 10 seconds. It does the same thing. It led to the Apple's logo then the loading circle. What can I do to fix this?

Broken iphone what should i do?

Last May, my Iphone dropped out of my pocket and the screen shattered, so my dad went to have it replaces (he went either to the apple store or the att store, I'm not sure). My parents were upset that I had broken my phone though, and told me to be extra careful with it, since I had only gotten it 6 months prior.
Well today without me noticing I dropped it and now the back is all cracked! Replacing an Iphone is $150 I think with the warranty. If I go to the apple store and give them $150 in cash for a phone, will they put my sim card in a new device?

Right now, my phone has a case on it so no one will notice my phone is broken unless I take it off. However, I can't keep the case on forever and I don't want my parents to know that my phone broke again. What are my options?

Why did my computer stop charging my iphone?

I have tried all the ports and changed usb cables, It charges using the wall. I tried plugging in a flash drive and it didn't recognize that either. Itunes does not recognize it either, The itunes program says I need to plug in my phone using a usb cable. Could I have accidently hit something that turned off my power to my ports?

Why can't T-mobile sell the iPhone?

Seriously! I'm stuck with this stupid Android! All my cousins and friends have the iPhone 4 except for me and my family! Why can't tmobile just sell the iphone. But seriously why can't t-mobile just sell it? Every other major company even prepaid companies are selling it except for t-mobile. I just want one so bad~

Lifeproof case.is it worth it?

I've had my Iphone 4s since march and i spent $200 on it so I really don't need anything to happen to it. I had an otterbox but the silicon tore up soon after I bought it. I saw where this site is selling the lifeproof's and their really cute. My birthday's coming up. So should I get one? I need something that will last and protect my iphone from drops. The summer is practically over so i won't be taking underwater pictures for a while. Besides that, is it worth $80? Is it better than the Otter box? The Otter works really well but it's so bulky and get dirty really easily. And the underwater pictures seem really cool. Which one is better?

Flashing an Iphone 4S

A friend recently gave me her Iphone 4S(on verizon) and i have cricket. I know its possible to flash from verizon or sprint to cricket.
Here's the problem, i found a flashing store near me and their site says they can flash an iphone 4s, well when i emailed them to confirm how much it would cost they tell me they can't flash the iphone 4s ONLY the iphone 4?
Can someone please explain why?
Thanks!

Added (1). I've received mixed answers about this. People has said that they have flashed the iphone 4s and there are videos on youtube showing it being doe but this "flash" guy said its not possible with iphone 4s…
I'm really confused. The only thing different about iphone 4 from the 4s is: better signal strength, siri, battery, and the camera.