My Iphone 4 won't turn on - 1

**I unlocked my iphone to use it as tmobile**
I installed the iOS 6.1 or something and it turned off. I turned it back on and it said to connect with Itunes, I didn't have Itunes at the time and I needed to use my brother's or sister's but they weren't home. A few hours later, I got tired of waiting so I searched on google and it said to hold the home button and the on/off button on the top right corner. I did, and it turned off. But ever since that happened, I can't turn it back on.
I asked my brother for help, he tried connecting it to his Itunes and tried charging it but it doesn't recognize it.
Help! How do I turn my Iphone 4 on! ):
Do I get a new battery? What should I do! )

Broke from unlock

It is normal for it to do that for a couple days. It can happen after an update. It may help if you keep it plugged in too. If it doesn't come back on after a couple of days, I would contact Apple or T-Mobile.

I have exactly the same problem, any solution?