Hi dave2370,
Welcome to the Support Communities!
I'm sorry to hear you are having issues with your iPhone. The red End Call button should still be working.
For initial troubleshooting, I would suggest restarting and resetting your iPhone, and also updating it to the latest version of the iOS software, which is iOS 6.1.4.
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
- Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, and then slide the slider.
- Press and hold the Sleep/Wake button until the Apple logo appears.
Note: Reset your device only if you are unable to restart it.
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
iOS: How to update your iPhone, iPad, or iPod touch
I hope this information helps ....
Have a great day!
- Judy