Iphone 4s IOS 7 & Activation Error?

I had the IOS 7 Beta and my phone has been working phone until tonight when I went to use my phone and it was locked saying I'm not a registered developer and now my phone is locked. I can't do anything except turn the phone on or off. I tried to connect to itunes and it won't do that, It will charge but won't sync to itunes. I tried multiple usb ports, different cords, I tried updating drivers, uninstalling and reinstalling itunes. I've tried everything. My phone is complete trash because now I can't fix the activation error because my phone won't connect to itunes. Also each time I plug my phone in it asks if I trust this computer and each time I click Trust it stops charging then starts charging again and asks the same question. WHat do I do?

Delete your ios7 beta

You need to restore your phone.
hold down power button to power off the device.
with the device off hold down the home button and connect to charge cable connected to computer with itunes and your most recent backup.
complete the restore process and then do a restore from backup from itunes.

Having this same problem, but I can't back up because Find My iPhone is on, but I can't turn it off either, because my phone is deactivated.

You go to this link http://www.redsn0w.us/2013/09/download-702-ios-ipsw-firmware.html and download the iOS 7.0.2 ipsw firmware for your appropriate apple device. After that, you connect your apple device to itunes and you go to the device summary. From there you hold the shift key and click on "check for update" at the same time. Then a pop up should come out on your screen, and you search for the firmware you downloaded. After you find the firmware click on it and your device should start to update. After completion you will still see the error but ignore that. Unlock the screen and from there it will ask you to sign in with your apple ID, do that and will unlock your apple device.
ALSO BE SURE TO HAVE THE LATEST VERSION OF ITUNES.

---Note that if you have an iphone you MIGHT NOT have service for a couple of minutes but you will eventually get service again.

I see that you said that your itunes doesn't detect your iphone, try putting it in recovery mode. If you don't know how, search for a tutorial on YouTube; it's really easy.

This website has all the directions to fix it. It helped me immensely cause the same thing happened to me!

http://iosfixsite.weebly.com

Working with a Mac:

Go to ~/Library/iTunes/iPhone Software Updates

Open folder and look for.ipsw file and delete it if it's there.

Working with a Windows Vista, 7 or 8:

Go to Start - Control Panel - Appearance and Personalization - Folder Options - Show Hidden Folders

Then Go to

Start - Computer - C: - Users/yourusername/AppData/Roaming/Apple Computer/iTunes/iPhone Software Updates

Remove the.ipsw file if it's in the folder.

Then open iTunes. Hold down your home button for about 10 seconds and as you're holding it down connect it to your computer. Do NOT let go until you see the iTunes logo and a USB cord picture appear on your phone screen.

iTunes should then give the message that it detects an iPhone in recovery mode and that the device needs to be restored. Click OK and then Restore iPhone. This will install 7.0.2.

I hope you have a back up in iTunes or iCloud, otherwise, you will lose data because this will reset the device to its factory settings.

Good luck, and try not to download software before its official release so that things like this don't happen in the future.