Here's how I did it:
1. Open Safari and go to http://mqmobile.com/iOS7Bugs/iPhoneURLScheme.html
2. Click the
button and then Save to Home Screen3. Open the App from the home screen and hold your finger down on the Phone link for 2 seconds. You will be given options to make a call or send a text.
4. (Skip this step if you like having a working phone) Select the option to make a call. The call will be made but you will not be switched to the Phone app. You will see a message at the top to switch back to the call but you will not be able to. I ended up having a nice conversation with the ATT operator where she just kept saying 'Hello, hello, hello.' Once she hung up my phone screen went black and it's remained that way since.
The hardware buttons still work, holding down home to bring up Siri, turning the ringer on and off and adjusting the volume, so at least I have that. Thanks iOS 7, you've basically rendered my phone as a device that allows me to have nonsense conversations with Siri.
