I have an Iphone 4 with IOS 6 and my emails have disappeared.  I also have a very slow reaction time to my touch screen.

I have an Iphone 4 with IOS 6 and my emails have disappeared.  I also have a very slow reaction time to my touch screen. Help!

Hello there, parihargs1.
To troubleshoot display brightness issues the following article provides 2 key steps:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Of note is the following:
Display has no backlight or dark screen
Toggle the ringer switch to see if the unit vibrates. If it does, it could be that iPhone is getting power, but is not displaying any image.
Try turning iPhone off and then on again.
While connected to the iPhone charger, try to reset the iPhone.
If the low-battery screen appears, charge the iPhone.
Display does not adjust brightness automatically
The ambient light sensor brightens the display when using the iPhone in brightly lit environments, and dims the display in low light. To test this sensor, do the following:
If the iPhone is in a protective case, remove it from the case. If there is a protective film on the display, remove the film.
Verify that the Auto-Brightness setting (Settings > Brightness and Wallpaper) is set to ON, and that the Brightness level is set near the middle of the slider.
Press the Home button to return to the Home screen and then press the Sleep/Wake button to lock the iPhone.
In a bright environment, cover the top third of the iPhone to block the light, then press the Sleep/Wake button or the Home button to wake the phone. Slide the slider to unlock the phone.
Notice the brightness of the screen and application icons; they should be somewhat dimmed.
Remove the cover from the top of the display and in a few moments the display should get brighter.
If these steps do not resolve your issue please refer to the "Issue not resolved" section for your next step.
Thansk for reaching out to Apple Support Communities.
Cheers,
Pedro D.

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