How to get into a locked iphone 4?

I have at&t, i searched everything but in the comments they all said that it doesn't work, and i don't want to reboot it but i will if its the only choice i have. And btw i forgot my password incase you guys think i stole it or found it

Added (1). And i have the latest update

If you've backed it up recently, you should be all good after it goes into DFU mode. If not, then you'll lose everything between now and your last back up.

Connect to iTunes. Reset the phone then download your stuff from iCloud