IPhone 5 won't turn on after screen replacement?

My iPhone worked fine, until it got smashed and ruined the digitizer and the LCD. After a couple months i finally ordered the parts to replace the screen. When they got here, i pulled the old screen out and put the new screen in following a video on YouTube. When i was done, i figured the battery would be dead since it hasn't been on in a couple months so i plugged it into the wall and it does nothing. It dosent even respond when i plug it into the computer, and the computer dosen't recognize anythings been plugged in.

Sprint mobile, I need to cancel this service

Okay so I bought an iPhone 5s at a local sprint store on December 19, 2013.It is now January 6, 2013.
The day I went in I was looking for a new phone and I wanted to get out as soon as possible to go shopping for Christmas presents with my girlfriend. So what happened is that the teenage representative was trying to sell me a case with a speaker for 80$ more. I didn't want and then it seems like she got really upset because I didn't want to buy it. So when I asked her how much I would be paying, she was rude and told me it was 102$. I didn't know why it would be so much. So I asked her. What exactly plans did she put me. She put the unlimited which I didn't want. So the phone rang up to 106$ with tax I was about to pay. But instead she insisted me to get accessories that add to 100$. I didn't know why but I got them. Then after I didn't sign any papers and she didn't review anything.
I hate this service it is a nightmare, how can I cancel this if it pass did the 14 refund policy?

I need to delete a message from my iPhone w/o going into the app?

So I texted my friend the full chemical name for Titan (longest word in the English Language) and now I can't open the app. So I need to delete the message without going into the app.

Added (1). I fixed it! But if you want some points, I'll pick the most random sentence for best answer. Free points!

Added (2). If anyone in the future wants to know, you do a search for someone else and then go back to the list of convos. And delete the entire convos. With the person.

How to make it say 'imessage' on the lock screen?

I have an iphone5. When people text me, on the lock screen it shows the actual text. Instead of their text being there i want it to say 'iMessage' and i've seen peoples phones do that, how do i make it like that? My parents are nosy and think they can check what people are texting me…

Downgrading iOS firmware from 7 to 6.1.3?

I saw a YT vid, and followed the steps. I downloaded iFaith, got the shsh blobs out of Cydia and created a custom ipsw. Now when I try to shift+restore in iTunes it says that I need to install a newer version of iTunes (11.1) but the dude in the vid said that it only works on the older version. Fix? BTW i have a gsm iphone 4.

Is there a minimum time in order to early terminate a verizon contract?

I want to get an iphone 5s from Verizon and I heard they sell them unlocked with 2 year agreement. They have a 350 early termination fee so it's 125+350=475.So in the end, it will be cheaper than the unlocked cost. So I was wondering if this would work and would there be a minimum service time verizon requires?

Laptop suddenly stopped connecting to iphone 5 hotspot?

For a week my toshiba laptop worked fine with my iphone 5 hotspot. Today it will not connect.
I did change the password this morning and whether or not that has something to do with it I don't know, but now when I attempt to connect to it I just get a spinning circle and "can't connect".
It does not give me an option to enter in a PW. I have connected other devices and computers to my
iphone so thats ruled out. I even reset the network connections on my iphone to no avail.
Any ideas on what to do?

Can you unlock an iphone 5s from cricket to be with tmobile?

My dads friend gave him an iphone 5s for free since hes moving away and didn't understand how to use it so he gave it to me but its from cricket. My iphone 4s is unlocked and connected to t-mobile so i wanted to know if i can unlock that cricket iphone 5s and use it with tmobile and yes the iphone 5s has a sim card slot