My iphone won't charge at all?

I've tried everything re booting and restarting and its still on 48% but i need it for tomorrow and i'm scared it's just going to die on me. What shall i do? And i don't have the screws to unscrew the bottom of the phone.
If i ask the apple shop tomorrow do you think they will charge me for it?
What is the cause for this problem anyway?
It's an iphone 4s, it won't connect to itunes and yes i've tried different wires and sockets.

This cable is not certified and may not work reliably with this iphone?

I have had this message before, but my phone was plugged in. This time I was at a concert wearing a bag that was loose on my body and my phone was in it. It could be easily taken out without me noticing. I took it out and the message appeared. Is it possible that someone plugged something in to my phone and put a virus or something on it? Or am I just being paranoid?

No memory on my iPhone when I've hardly downloaded anything?

I have a 16GB iPhone 5S that for some reason is almost out of memory. According to iTunes, I have 498.3MB audio memory, 309MB data of photos, 322.1MB data used for apps, 180.5MB used for documents and then 11.33GB used for 'other' although I have no clue of that this 'other' is and why I have no memory on my phone. It's a pain in the neck because I can't download anything or take pictures because my phone runs out of memory so quickly. Does anyone have any idea of what could be wrong with my phone? Thanks in advance, I'll be very grateful for answers to this.

How to fix a cracked iPhone 5 screen?

I just cracked the screen of my iPhone 5 and I'm freaking out. It's not a big crack, it's on the bottom right. But I really would like to know how much it would cost to fix it? Is there another option that won't be too expensive?

What do you do if you lost your iphone on college campus?

Uhm… I don't know what to do, i mean i miss place my phone and now it gone i mean i was in the bathroom changing for pe and forgot my iphone 4s and i don't know what to. I went to campus polices and they don't have it and now i'm afraid what would happen when i face my mom T-T please help. Is there an way to find your phone in a day my phone don't have wi-fi or for some reason my ring tone doesn't work so i don't who pick it up. Plus i'm afraid that person might kept it and don't return it to the campus polices. So how to find your phone in a large campus (merced college). Please help when i'm still alive lol jk jk moms are scary when their angry. T-T